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Checklist · 10 picks · 4 categories

fish tank checklist

Edited by Zach · updated Oct 30, 2026 · How I pick

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Fish look low-maintenance, but the tank is doing a lot of quiet work. A starter kit gets you the tank, light and filter in one box, and the bigger kits here also include a heater, which tropical fish need.

Read more

If yours doesn't, add one: the small Tetra holds a steady 78 degrees, and the Eheim and Fluval let you dial in the temperature. Water conditioner is non-negotiable, because it treats tap water before it goes in the tank. A filter upgrade is a nice-to-have once you know you're hooked. Every pick won a category in BestReviews' guides to starter kits, heaters, water treatments and filters. Each card shows the drawback BestReviews called out, so you can skip the rookie mistakes and get to naming your fish.

Who this is not for. Skip this if you want a hamster, guinea pig or rabbit; the Other Pets list covers those setups.

plan my budget pick an amount ↓

Tell me what you can spend. I pick a tier for every item, essentials first, and show what is left. The first amount covers everything you need at the cheapest tier.

My budget

Pick a budget to see your plan.

see the plan, item by item

Estimates based on typical prices, checked Oct 30, 2026. Prices change; see the store for today's price.

The must-haves

0 of 3 on your list · tap one to see your options

Showing all 10 picks

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01 Tank

the first pick is the one I would start with
Compare these 3
PickTierPriceBest forEvidence
Koller Products AquaView 6.5-Gallon Fish Tank Starter Kitbudget$50-100a couple of small fish on a desk or dresser1 outlet
Aqueon Aquarium Fish Tank Starter Kit, 10 Gallonmid$50-100tropical fish with everything in one box1 outlet
Tetra ColorFusion Aquarium 20 Gallon Fish Tank Kitsplurge$150-200going bigger from day one1 outlet
Best aquarium kit

budget pick · 6.5 gal

Koller Products AquaView 6.5-Gallon Fish Tank Starter Kit

Best for a couple of small fish on a desk or dresser

BestReviews' best bang for the buck fish tank starter kit: a 6.5-gallon size that can handle a couple of fish, with a quiet filter and color-changing LEDs.

Heads up. It can crack if you move it while it's full, and gravel and plants aren't included

1 outlet. BestReviews best Bang for the Buck fish tank starter kit.

$50-100

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mid pick · 10 gal

Aqueon Aquarium Fish Tank Starter Kit, 10 Gallon

Best for tropical fish with everything in one box

BestReviews' feature-packed top pick among 10-gallon tanks: it comes with an LED hood, a power filter with a change alert, a heater and water conditioner.

Heads up. The lights tend not to last long

1 outlet. BestReviews top Pick 10-gallon fish tank.

$50-100

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splurge pick · 20 gal

Tetra ColorFusion Aquarium 20 Gallon Fish Tank Kit

Best for going bigger from day one

BestReviews' best of the best fish tank starter kit: comes with everything you need to give your fish a spacious, comfortable home.

Heads up. BestReviews notes the tank walls can feel flimsy

1 outlet. BestReviews best of the Best fish tank starter kit.

$150-200

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02 Heat

Compare these 3
PickTierPriceBest forEvidence
Tetra Submersible Heaterbudget$15-25small tanks up to 10 gallons1 outlet
Eheim Jager Aquarium Thermostat Heatermid$25-50picking your own water temperature1 outlet
Fluval Submersible Aquarium Heatermid$25-50a heater you set once and forget1 outlet
Best aquarium heater

budget pick · 2-10 gal tanks

Tetra Submersible Heater

Best for small tanks up to 10 gallons

BestReviews' top pick for small spaces: it reliably keeps water at a constant 78 degrees, good for most tropical fish.

Heads up. Only one preset temperature

1 outlet. BestReviews best for Small Spaces aquarium heater.

$15-25

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mid pick · 25-300 W

Eheim Jager Aquarium Thermostat Heater

Best for picking your own water temperature

BestReviews' best bang for the buck aquarium heater: simple to install, with a selectable temperature dial and auto shut-off when dry.

Heads up. Must be calibrated for best results

1 outlet. BestReviews best Bang for the Buck aquarium heater.

$25-50

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mid pick · 50-200 W

Fluval Submersible Aquarium Heater

Best for a heater you set once and forget

BestReviews' best of the best aquarium heater: especially durable and shock-resistant, with an adjustable dial.

Heads up. Not completely submersible

1 outlet. BestReviews best of the Best aquarium heater.

$25-50

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03 Water

Best water conditioner

budget pick · Bottle

API Stress Coat Water Conditioner

Best for every water change on a budget

BestReviews' best bang for the buck water conditioner: add it to tap water to protect your tank and its fish.

Heads up. The aloe vera may lead to some slime in the filter

1 outlet. BestReviews best Bang for the Buck water conditioner.

under $15

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mid pick · Bottle

Seachem Prime Fresh & Saltwater Conditioner

Best for fresh or saltwater tanks

BestReviews' best of the best water conditioner: detoxifies heavy metals in tap water without changing pH.

Heads up. A few bottles arrived with a broken seal or no lid, per BestReviews

1 outlet. BestReviews best of the Best water conditioner.

$15-25

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04 Filter

Best aquarium filter

budget pick · 10-40 gal tanks

Hygger Aquarium Double Sponge Filter

Best for a gentle backup filter for a small tank

BestReviews' simple yet solid top pick: removable sponges and ceramic balls, with suction cups to hold it in place.

Heads up. BestReviews flags murky water as a possible issue

1 outlet. BestReviews top Pick aquarium filter.

$15-25

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mid pick · Several sizes

AquaClear Power Filter

Best for upgrading the filter that came with your kit

BestReviews' best of the best aquarium filter: three methods of filtration, and it keeps water flowing even with dirty filters.

Heads up. BestReviews notes some longevity problems

1 outlet. BestReviews best of the Best aquarium filter.

$25-50

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means three independent outlets recommend a pick, means one, and limited evidence means none has yet. I research these picks. I have not tested them myself. How I pick · Broken link, wrong price range or an outdated pick? Tell me

Side by side

Questions people ask

What do I need for a beginner fish tank?

A tank with a light and filter (a starter kit covers those), a heater for tropical fish, and a water conditioner to treat tap water. The Aqueon 10-gallon and Tetra 20-gallon kits here come with a heater and conditioner in the box.

Do I need a heater for my fish tank?

For tropical fish, yes. BestReviews' top pick for small tanks, the Tetra Submersible Heater, keeps water at a constant 78 degrees in 2- to 10-gallon tanks, but it has only one preset temperature. The Eheim Jager and Fluval let you adjust it.

Which water conditioner should I get?

BestReviews' best of the best is Seachem Prime, which detoxifies heavy metals and doesn't change pH. Its budget pick, API Stress Coat, treats tap water for less, though its aloe vera can leave some slime in the filter.

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