Setting up a home aquarium requires six essential categories of supplies: a tank, a filter, a heater (for tropical fish), lighting, a water conditioner, and a test kit. If you have these six things and the knowledge to use them, you can keep fish successfully. Everything beyond this core list, enriched substrates, CO2 systems, protein skimmers, specialty media, and advanced lighting, is optional and depends entirely on what you're trying to accomplish.
This guide covers all the supply categories for home aquariums, what to look for in each category, specific products worth considering, and what you can skip when starting out. I'll also point out where to find the best prices, because the aquarium hobby has a wide range of products at wildly different price points, and knowing which expensive items are worth paying for versus which budget options work just as well saves real money.
The Tank: How to Size Right the First Time
The most common beginner mistake is buying too small a tank. This sounds counterintuitive because smaller tanks seem simpler and cheaper. In practice, small tanks are harder to maintain because water quality changes faster in lower volumes. A 5-gallon tank with two fish can spike from safe ammonia levels to dangerous levels in 12 hours. A 20-gallon tank with the same fish gives you much more buffer.
For most people setting up their first home aquarium, a 20-gallon long (30" x 12" x 12") or a 29-gallon (30" x 12" x 18") is the right starting point. Both sizes accommodate a wide range of fish species, are large enough to have stable water chemistry, and are small enough to fit comfortably on a dedicated aquarium stand in most rooms.
Tank options by size and price range: - 10-gallon: Aqueon 10-Gallon Standard, $25-35. Good for bettas, small species, shrimp tanks. - 20-gallon long: Aqueon 20-Gallon, $45-60. Best general-purpose beginner size. - 29-gallon: Aqueon or Marineland 29-Gallon, $55-75. More depth for taller aquascapes. - 40-gallon breeder: Aqueon 40-Gallon Breeder, $80-110. Wide footprint, popular for planted tanks. - 55-gallon: Aqueon or Marineland 55-Gallon, $90-130. Lots of fish, more stability, heavier and needs a reinforced stand.
For freshwater, glass tanks are the standard recommendation. Acrylic is lighter and clearer but scratches more easily during cleaning. Rimless tanks from brands like Innovative Marine or Ultum Nature Systems look elegant but cost more.
Filtration: The Most Important Equipment You'll Buy
No aquarium supply is more important than the filter. The filter processes ammonia from fish waste through beneficial bacteria colonies, preventing the buildup of toxic compounds. Without adequate filtration, even a lightly stocked tank becomes dangerous for fish within days.
Hang-On-Back (HOB) Filters
For tanks up to 55 gallons, a quality HOB filter is the most practical choice. The best in class:
AquaClear Series (20, 30, 50, 70): The AquaClear is widely regarded as the best value HOB filter available. It accepts sponge, carbon, and bio-ring media, and the flow rate is adjustable. Unlike cheaper filters with proprietary replacement cartridges, the AquaClear uses standard media that costs less and can be customized.
Seachem Tidal 35 and Tidal 55: These have a self-priming feature that restarts the filter after power outages without manual intervention. The media basket is accessible from the top, which makes cleaning much easier than reaching into the tank.
Canister Filters
For larger tanks (40+ gallons), aesthetically focused setups where you want equipment hidden, or heavily stocked tanks needing extra biological capacity, a canister filter is the premium choice.
The Fluval 207 (rated to 45 gallons), 307 (rated to 70 gallons), and 407 (rated to 100 gallons) are the most popular home aquarium canister filters. They're reliable, well-supported with replacement parts, and the media baskets are large enough to run substantial quantities of bio-media like Seachem Matrix.
Sponge Filters
For betta tanks, shrimp tanks, fry tanks, or any setup where gentle flow is needed, a sponge filter powered by an air pump is ideal and inexpensive. The Hikari Bacto-Surge and Aquaneat Bio Sponge filters cost $5-10 and last for years. Pair them with a Tetra Whisper AP-10 or similar air pump ($10-15).
Heaters: More Critical Than Most Beginners Realize
Tropical fish need water temperatures between 72 and 82°F to stay healthy. Room temperature in most homes falls below this range. A reliable heater is genuinely non-negotiable for most freshwater fish.
The sizing formula: 3-5 watts per gallon. A 20-gallon tank needs a 75-100W heater. The specific brands that stand out for reliability:
Cobalt Aquatics Neo-Therm: Excellent temperature accuracy (within 0.5°F), flat profile that blends into the tank, and a solid track record for long-term reliability. Available in 25W, 50W, 75W, 100W, 150W, and 200W.
Eheim Jager: The German-engineered standard for aquarium heaters. Consistently accurate, long-lasting, with a recalibrate feature that lets you adjust the dial to match actual tank temperature. Available from 25W to 300W.
Inkbird ITC-306A (temperature controller): This is not a heater itself but a plug-in controller that connects any heater to a precise thermostat probe. If you buy a less expensive heater, pairing it with an Inkbird controller adds safety protection against the most dangerous heater failure mode (sticking in the "on" position).
Always verify heater performance with a separate aquarium thermometer. Heater dials are not always accurate, and the stakes for getting this wrong are high.
Lighting: Match the Light to What You're Growing
For fish-only tanks, almost any LED light works. For planted tanks, light intensity is a genuine performance variable.
Fish-only and low-light planted tanks (Anubias, Java fern, Cryptocoryne): - Aqueon LED Strip Light - Nicrew ClassicLED - Any basic LED bar in the $20-40 range
Medium-light planted tanks (Amazon swords, most stem plants, Vallisneria): - Nicrew ClassicLED Plus - Hygger 957 Full Spectrum LED - Fluval Aqua Sky 2.0
High-light planted tanks (carpeting plants, demanding stem plants, CO2 injection): - Fluval Plant 3.0 - Finnex Planted+ 24/7 - Chihiros RGB Vivid Series
Run lights on a timer (8-10 hours per day). More than 12 hours of light daily promotes algae growth reliably.
Check our best aquarium equipment for home guide for specific recommendations organized by tank size.
Substrate: Matching Bottom Material to Your Goals
For fish-only tanks: Standard aquarium gravel (Caribsea Super Naturals, Imagitarium, or any inert gravel) works perfectly. Choose a grain size appropriate for your fish (corydoras prefer sand or fine gravel to protect their barbels).
For planted tanks with root-feeding plants: Enriched substrate makes a significant difference. Options include: - Fluval Stratum ($30-50 per 8kg bag): Lightweight volcanic substrate that softens water slightly and provides nutrients. - ADA Aqua Soil ($60-80 per 9L bag): The premium option used by competitive aquascapers. Excellent buffering capacity and nutrient content. - CaribSea Eco-Complete ($25-35 per 20lb bag): Basalt-based enriched substrate, readily available. - Seachem Flourite ($25-40 per 15lb bag): Clay-based, neutral pH, long-lasting nutrient source.
For planted tanks using inert substrate, Seachem Flourish Tabs (root tabs) inserted near plant roots every 3-4 months provide nutrients without switching substrate.
Water Care: Non-Negotiable Supplies
Water conditioner: Every time you add tap water to your tank, you need to neutralize chlorine and chloramine. Seachem Prime is the standard choice because it's highly concentrated (a small bottle treats enormous volumes of water) and also detoxifies ammonia and nitrite at double dose. API Stress Coat is a solid alternative.
Test kit: The API Freshwater Master Test Kit tests ammonia, nitrite, nitrate, and pH using liquid reagents. It's significantly more accurate than test strips and gives you the data you need to diagnose water quality problems. This is one of the most used and most valuable supplies in home fishkeeping.
Beneficial bacteria: When setting up a new tank, beneficial bacteria starters like Seachem Stability, Tetra SafeStart Plus, or Fritz Turbo Start 700 help establish the nitrogen cycle faster. They don't eliminate the cycling process but can meaningfully reduce it.
For more on what the nitrogen cycle is and why it matters, the basic concept is that fish produce ammonia, beneficial bacteria convert ammonia to nitrite, and different bacteria convert nitrite to nitrate. Nitrate is removed by water changes. The tank is "cycled" when ammonia and nitrite both stay at 0 between water changes.
Maintenance Tools
Gravel vacuum/siphon: A Python No Spill Clean and Fill connects to a faucet and makes water changes dramatically easier. The Lee's Gravel Vacuum is a manual alternative for smaller tanks. Either tool lets you remove detritus from the substrate during water changes.
Magnetic algae cleaner: Flipper Float, Mag-Float, or similar. Scrubs algae from the glass without getting your hand wet during every cleaning session.
Dedicated bucket: Never use a bucket for aquarium work that's been used with soap or cleaning products. The residue is lethal to fish. Keep a separate 5-gallon bucket labeled "fish only."
When to Add Optional Supplies
The supplies above cover everything needed to maintain a healthy aquarium. These additional items are worth adding when you have a specific reason:
CO2 system: Add when growing medium-to-high-light plants. The Fluval Mini Pressurized CO2 Kit works for tanks up to 15 gallons; for larger tanks, a pressurized CO2 system with a regulator, solenoid, and diffuser.
UV sterilizer: Useful for controlling free-floating algae (green water), eliminating pathogens, and improving water clarity. The OASE Bitron C and Aqua Ultraviolet Advantage lines are well-regarded.
Protein skimmer: Saltwater and reef tanks only. Not applicable to freshwater.
Fertilizers: For planted tanks. Seachem Flourish Comprehensive for trace elements, and a nitrogen-phosphorous-potassium (NPK) fertilizer like Easy Green if plants show nutrient deficiencies.
For a detailed comparison of equipment across all categories, see our best aquarium equipment roundup.
FAQ
What's the minimum setup for a home aquarium?
The absolute minimum: a tank of at least 5 gallons, a filter, a heater (if keeping tropical fish), water conditioner, and something to check water parameters (test kit or strips). A light is needed if you want to see the fish or grow plants, but fish don't strictly require artificial lighting if the room gets natural light during the day.
How much does a complete home aquarium setup cost?
A solid beginner setup for a 20-gallon community tank runs $150-250. This includes the tank, AquaClear 30 filter, Eheim Jager 75W heater, basic LED light, substrate, API test kit, and water conditioner. Adding decor, live plants, and fish stock adds another $50-100. A planted tank setup with quality lighting and enriched substrate runs $250-400 before fish.
Can I use tap water for a home aquarium?
Yes, with a water conditioner like Seachem Prime to neutralize chlorine and chloramine first. Let the water sit for a few minutes after adding conditioner before pouring it into the tank. If your tap water has extreme pH (below 6.5 or above 8.0), test it with the API kit and consider adjustments, though most freshwater fish tolerate a pH range of 6.5-7.5 without issues.
How often do I need to maintain a home aquarium?
Weekly: 20-25% water change with gravel vacuuming. Every 2-4 weeks: rinse filter media in tank water (not tap water). Monthly: check heater accuracy with thermometer, top off evaporated water. Quarterly: replace chemical filter media (carbon), add root tabs if using planted substrate. Annually: inspect all equipment seals and impellers.
Start Simple, Expand as Needed
The best home aquarium supply approach is to start with quality basics and add specialized equipment only when you have a clear reason. A tank with an AquaClear filter, Eheim heater, basic light, Seachem Prime, and API test kit handles the vast majority of freshwater fish setups without additional equipment. Add CO2, UV sterilizers, and specialized media as specific goals or problems arise. The money saved by not buying equipment you don't need is better spent on higher-quality fish and healthier live plants.