Top Fin Essentials 5-Gallon Starter Kit


TopFin Tanks® Verdict

Top Fin Essentials 5-Gallon Starter Kit

★★★★½

The best all-in-one 5-gallon aquarium kit under $60. Everything a betta needs in one box — gentle filter, accurate heater, LED hood — with beginner-proof setup. Minor limitation: the strip thermometer is less reliable than a digital probe. Otherwise: exceptional value.

Best for: Betta fish, shrimp
Tank size: 5 US gallons
Kit includes: Filter, heater, LED
Setup time: 25–30 minutes
✓ Recommended

The Top Fin 5 gallon tank is consistently one of the best-selling beginner aquariums on Amazon — and for good reason. The Essentials Starter Kit bundles everything a first-time aquarist needs into a single, affordable box: a clear glass tank, a betta-safe filter, a pre-set heater, and LED lighting. No hunting for compatible accessories. No second-guessing wattage or flow rates. Just unbox, fill, cycle, and stock.

This guide gives you what no product listing does: exact specifications, an honest pros and cons breakdown, a species-specific stocking guide, a step-by-step setup checklist, and the specific filter and heater settings that make the difference between a thriving tank and a struggling one.

Top Fin 5 Gallon Tank — Full Specifications

Capacity 5 US gallons (18.9 litres)
Dimensions (L × W × H) 16″ × 8″ × 10″ (40.6 × 20.3 × 25.4 cm)
Glass thickness 4 mm tempered-style aquarium glass
Frame / trim Black plastic trim, top and bottom rails
Empty weight ~7–9 lbs (3.2–4 kg)
Full weight (water + substrate) ~52–55 lbs (23.6–25 kg)
Lighting LED hood — white daylight + blue moonlight modes
Filter included Top Fin Power Filter (low-flow, adjustable)
Heater included Adjustable submersible heater, pre-set 78°F (25.5°C)
Suitable for Freshwater only
Available at Amazon (affiliate link), PetSmart in-store

What’s Included in the Starter Kit

The Top Fin Essentials 5-Gallon Starter Kit includes everything below in the box. You only need to buy substrate, decorations, a liquid test kit, and fish food separately.

✓

Glass aquarium16″×8″×10″ clear glass with black trim. No distortion, scratch-resistant.
✓

LED hoodWhite daylight mode for viewing; blue moonlight mode for evening ambience.
✓

Power filter + cartridgeHang-on-back low-flow filter with adjustable intake. Betta-safe when set to lowest flow.
✓

Submersible heaterAdjustable dial, pre-set to 78°F. Auto shut-off if exposed to air. Perfect for bettas.
✓

Strip thermometerAdhesive external strip. Readable but less accurate than digital — upgrading to a digital probe is recommended.
✓

Water conditioner sampleNeutralises chlorine and chloramines from tap water on day one.
✓

Bacteria starter sampleSeeds the filter with beneficial bacteria to begin the nitrogen cycle immediately.
✗

Not included — buy separatelyGravel/substrate, decorations, liquid test kit (API Master Test Kit recommended), fish food.

Honest Pros & Cons

Pros
✓ Everything included in one box — no compatibility guesswork
✓ Glass tank gives crisp, clear viewing with no acrylic yellowing over time
✓ Filter flow is adjustable — genuinely betta-safe on lowest setting
✓ Heater pre-set to 78°F — ideal for bettas without any adjustment needed
✓ LED hood has two modes — white for daily viewing, blue for ambience
✓ Compact footprint — fits on desks, counters, shelving
✓ Price-to-value is hard to beat — typically $45–$65 complete
✓ Setup takes under 30 minutes — no tools required

Cons
✗ Strip thermometer reads 2–4°F warmer than actual water temp — replace with a digital probe ($5–$8)
✗ LED hood is adequate for low-light plants only — carpeting plants need an upgrade
✗ No gravel vacuum included — needed for weekly maintenance from day one
✗ Filter cartridge needs replacing every 3–4 weeks (ongoing cost ~$4–$6/month)
✗ Feeding flap on the hood is small — large freeze-dried foods can be tricky
✗ Stocking options are limited — this is a single-fish or invert tank, not a community setup

Fish Stocking Guide — What Lives in a 5 Gallon Tank

A 5-gallon tank is not a community tank. It thrives as a single-species or single-specimen setup. The table below shows every viable option with specific numbers — not vague ranges.

Species Count Temp (°F) Difficulty Notes
Betta fish (male) 1 76–82 Easy Best match for this kit. Adjust filter to lowest flow. One male only — no exceptions.
Cherry shrimp 8–15 65–80 Easy Excellent cleaners. Can keep with betta if tank is heavily planted and shrimp have hiding spots.
Nerite snails 2–3 72–80 Easy Best algae control option. Cannot reproduce in freshwater. Safe with bettas.
Endler’s livebearers 3–4 (all female) 74–82 Medium Keep all female to prevent overpopulation. Active, colourful, tolerate hard water.
Chili rasboras 6 68–82 Medium Nano fish (0.6″). Stunning red. Prefer soft, slightly acidic water. Very peaceful.
Ember tetras 5–6 73–84 Medium Orange-red nano tetra (0.8″). Hardy and active. Need a school of at least 5.
Goldfish 0 — — ✗ Do not keep. Goldfish need 20+ gallons minimum and produce excessive waste.
Neon tetras Avoid — — ✗ Technically possible at 3–4 but too cramped. Use ember tetras or chili rasboras instead.

Top Fin 5 Gallon Betta Tank — Setup & Care

The Top Fin 5-gallon starter kit was clearly designed with betta fish in mind. The filter flow is low and adjustable, the heater pre-sets to 78°F — the midpoint of the ideal betta range — and the 16-inch tank length gives a male betta a meaningful territory without wasted space. Here is exactly how to configure the kit for a betta.

Filter setting for betta fish

Bettas have long, flowing fins and cannot tolerate strong water currents — a betta struggling to swim against a strong filter is a stressed betta. Configure the Top Fin filter as follows:

  • Set the flow adjustment lever to the lowest position (fully closed)
  • If the current still pushes your betta around, create a baffle: cut a piece of filter sponge or a plastic bottle in half and place it over the filter outlet to deflect the flow against the glass wall, scattering the current
  • The correct flow rate should create a gentle surface ripple only — not a visible current in the water column
  • Signs of too much current: betta hides in corners, fins are clamped, betta breathes rapidly at the surface

Heater setting for betta fish

Leave the heater at its pre-set 78°F for most bettas. If your betta is very active and building bubble nests (a sign of contentment), the temperature is correct. Do not exceed 82°F — overheating shortens a betta’s lifespan by accelerating metabolism. In summer, if your room reaches 80°F or above, turn the heater off entirely — bettas can tolerate up to about 86°F for short periods but sustained heat above 82°F is harmful.

Expert tip: Bubble nests — floating clusters of tiny air bubbles at the water surface — are the single best indicator that your betta is healthy and content. If you see bubble nests within 2–3 days of setup, your tank conditions are excellent.

Step-by-Step Setup Guide

Total hands-on time: 25–30 minutes. Then 4–6 weeks of cycling before fish can be added.

1
Choose your locationPick a surface that can support 55 lbs. Avoid direct sunlight (causes algae), heating vents, and air conditioning units. A bookshelf, desk, or dedicated stand all work well. Ensure a power outlet is within 6 feet.

2
Rinse everything — no soap, everRinse the tank, any gravel or sand, and all decorations under running tap water until the water runs clear. Any soap residue will kill fish. Even brand-new gravel is dusty and will cloud your water if not rinsed thoroughly.

3
Add substrate and arrange decorationsAdd 1–2 inches of rinsed gravel or sand. Place any decorations, caves, or driftwood. For a betta tank, include at least one hiding place and some plants (real or silk — avoid sharp plastic that can tear betta fins).

4
Install the filterHang the filter on the rear glass. Slide the intake tube down until it sits 1 inch from the substrate. Insert the filter cartridge. Do not plug in yet — the filter must be submerged before starting.

5
Install the heaterClip the heater to the side glass at a 45° angle near the filter outlet for best circulation. Do not plug in yet — heaters must be fully submerged and equilibrated for 15 minutes before powering on, or the glass can crack.

6
Fill with dechlorinated waterFill the tank slowly using a plate placed on the substrate to avoid disturbing your arrangement. Fill to 1 inch below the bottom of the hood. Add the full dose of Top Fin Water Conditioner for 5 gallons before or during filling — this neutralises chlorine and chloramines immediately.

7
Add the bacteria starter & plug everything inPour the included bacteria starter directly into the tank. Wait 15 minutes, then plug in the heater. Prime the filter by pouring a cup of tank water into the filter body, then plug it in — flow should start within seconds. Attach the LED hood last.

8
Begin the nitrogen cycle — wait 4–6 weeksAdd a pinch of fish food every 2 days as an ammonia source. Test ammonia, nitrite, and nitrate weekly with an API Master Test Kit. The cycle is complete when ammonia = 0 ppm, nitrite = 0 ppm, and nitrate shows a slight rise. Only then add fish.

Live Plant Guide for the Top Fin 5 Gallon Tank

Live plants improve water quality by absorbing ammonia and nitrate, produce oxygen, and provide betta fish with natural hiding spots that reduce stress. The included LED hood supports low-light plants only.

Plant Light needed CO₂ needed Difficulty Notes
Java fern Low No Beginner Tie to driftwood or rock — never bury the rhizome in substrate or it will rot.
Anubias nana Low No Beginner Slow-growing. Bettas love resting on the broad leaves. Tie to hardscape.
Java moss Low No Beginner Provides excellent cover for shrimp fry. Can be tied to driftwood or left floating.
Marimo moss ball Low No Beginner Algae ball — a popular betta toy. Absorbs nitrates. Just place on the substrate.
Amazon sword (mini) Medium Optional Intermediate Use mini/dwarf variety only. Standard amazon swords outgrow a 5-gallon quickly.
Monte Carlo / dwarf hairgrass High Yes Advanced Requires upgraded LED and CO₂. Not compatible with the included hood.

Maintenance Schedule

A 5-gallon tank requires more frequent maintenance than larger tanks because the small water volume means parameter shifts happen faster. Follow this schedule and you will rarely have problems.

Weekly
☐ 20–25% water change (1–1.25 gallons)
☐ Gravel vacuum during water change
☐ Add water conditioner to new water before adding
☐ Check temperature with digital probe
☐ Observe fish for signs of illness (clamped fins, spots, lethargy)
☐ Wipe algae from glass with magnetic scraper

Monthly
☐ Replace filter cartridge
☐ Rinse filter body with tank water (not tap)
☐ Test ammonia, nitrite, nitrate with liquid test kit
☐ Test pH (betta ideal: 6.5–7.5)
☐ Trim any overgrown live plants
☐ Clean heater of any mineral deposits

Every 3 months
☐ Full glass cleaning inside and out
☐ Inspect silicone seals for discolouration
☐ Check heater accuracy (compare dial to digital probe)
☐ Inspect filter impeller for debris
☐ Deep gravel vacuum — go deeper than weekly clean
☐ Review stocking and plant density

Never replace the filter cartridge and do a water change on the same day — doing both at once removes too many beneficial bacteria and can spike ammonia.

Should You Get the 5 Gallon or Go Bigger?

The 5-gallon is the right tank for a betta fish or shrimp colony. But if your goal is a community of fish, you need a 10-gallon. Here is how they compare.

Feature Top Fin 5 Gal Top Fin 10 Gal Fluval Spec V (5 Gal)
Price (approx) $45–$65 $55–$80 $115–$130
Glass or acrylic Glass Glass Glass
Footprint (L × W) 16″ × 8″ 20″ × 10″ 17.2″ × 10.6″
Heater included ✓ Yes ✓ Yes ✗ No
Filter quality Good — adjustable HOB Good — HOB Power 10 Excellent — 3-stage integrated
Best for 1 betta / shrimp Community fish Betta / planted nano
LED quality Basic — low-light plants only Basic — fluorescent Excellent — medium plants
Verdict Best value beginner betta tank Best for community fish Best for planted / design

Our recommendation: If you want a betta — get the Top Fin 5-gallon. If you want multiple fish — skip straight to the Top Fin 10-gallon. The 5-gallon is too small for a genuine community of fish and the step up to 10 gallons in price and space is minimal.

Common Problems & Fixes

Problem Most likely cause Fix
Cloudy white water Bacterial bloom during cycle Normal — leave it. Clears in 3–5 days once bacteria establish.
Green water Algae bloom from too much light Reduce light to 8 hours/day. Block any direct sunlight. Add nerite snails.
Filter not flowing Jammed impeller or low water Unplug, remove impeller, rinse, reinsert. Top up water level. See our filter guide.
Betta clamping fins Filter current too strong / too cold Set filter to lowest flow. Check temperature — must be 76°F minimum.
Temperature wrong Strip thermometer inaccurate Buy a $5 digital probe. Strip thermometers read 2–4°F higher than actual water.
High ammonia after water change Replaced cartridge same day as water change Never do both on the same day. Do emergency 30% water change to dilute ammonia.

Frequently Asked Questions

Is the Top Fin 5 gallon tank good for betta fish?
Yes — the Top Fin Essentials 5-Gallon Starter Kit is one of the best betta tank setups at its price. The included low-flow filter can be adjusted to a betta-safe current, the 78°F preset heater is ideal for bettas, and the 16-inch length gives a male betta sufficient horizontal territory. Bettas moved into this tank from a bowl typically show improved colour and begin bubble-nesting within 48 hours.
What fish can I keep in a Top Fin 5 gallon tank?
Best options: one male betta fish, a colony of 8–15 cherry shrimp, 2–3 nerite snails, 3–4 endler’s livebearers, or 6 chili/ember rasboras. Do not keep goldfish, cichlids, or any fish over 2 inches. Never keep two male bettas together.
What comes in the Top Fin 5 gallon starter kit?
Glass aquarium (16″×8″×10″), LED hood, low-flow power filter with starter cartridge, adjustable submersible heater (pre-set to 78°F), strip thermometer, water conditioner sample, and beneficial bacteria starter. You need to buy substrate, decorations, and fish food separately.
How long does it take to set up a Top Fin 5 gallon tank?
Physical setup takes 25–30 minutes. However, the tank must cycle for 4–6 weeks before fish can be safely added. During cycling, beneficial bacteria establish in the filter media and convert toxic ammonia into safe nitrate. You can speed this up with Top Fin Bacteria Starter and Pre-Conditioned Aquarium Water.
How much does the Top Fin 5 gallon tank cost?
The Essentials 5-Gallon Starter Kit typically retails between $45–$65 on Amazon. The standalone glass aquarium without equipment is $25–$35. It is one of the most affordable complete kits on the market.
Do I need a heater for the Top Fin 5 gallon tank?
Yes, for tropical fish. Bettas, guppies, tetras, and cherry shrimp all require 72–82°F. A room at 68°F or below will drop the tank to unsafe levels without a heater. Use the included heater or the Top Fin CH50 (50W). Do not use a 100W or 150W heater in a 5-gallon — it will overheat the small water volume rapidly.
How often should I do water changes?
Change 20–25% weekly — approximately 1 to 1.25 gallons. Use a gravel vacuum to remove waste from the substrate. Always treat new water with Top Fin Water Conditioner before adding. Never change more than 30% at once.
Can I use live plants in the Top Fin 5 gallon tank?
Yes — and we strongly recommend it. Best low-light plants for the included LED: Java fern, Anubias nana, Java moss, and marimo moss balls. These need no CO₂ or fertiliser. For carpeting plants like Monte Carlo you will need to upgrade the LED hood.