Fresh water fish supplies break down into five essential categories: filtration, heating, lighting, water treatment, and feeding. You can keep healthy fish with a focused investment in the right gear from each category without overcomplicating things. A well-equipped 20-gallon freshwater community tank runs about $150 to $200 for all supplies, while a larger 55-gallon setup lands around $350 to $500 depending on how you configure it.
This guide covers every supply type you'll need, from the basics of cycling your tank to the specific products that have stood up over time for real hobbyists. I'll also touch on where to source supplies affordably and what you can safely skip for fish-only setups.
Filtration Supplies
Filtration is the backbone of any healthy freshwater tank. Without it, ammonia from fish waste accumulates and becomes toxic within days. A filter handles three processes: mechanical filtration (trapping particles), biological filtration (bacterial colonies that process ammonia), and chemical filtration (activated carbon removing dissolved compounds).
Choosing the Right Filter
For tanks up to 55 gallons, hang-on-back (HOB) filters are the most practical choice. The AquaClear 70 Power Filter ($55 to $65) handles up to 70 gallons and uses an open media basket that lets you customize your biological, mechanical, and chemical filtration independently. Its flow rate is adjustable, which matters for slow-moving fish like bettas and gouramis.
For tanks 40 gallons and up where you want more biological filtration capacity, canister filters outperform HOB models. The Fluval 307 Performance Canister Filter (rated to 70 gallons) runs about $150 and includes multiple media baskets. The Eheim Classic 350 is a German-made alternative at $120 that runs quieter than most canisters and is exceptionally reliable.
For nano tanks under 10 gallons or shrimp setups, a simple sponge filter powered by an air pump is the best choice. The Aquarium Co-Op coarse sponge filter plus an Aquatop AP-100 air pump costs around $20 total and provides excellent biological filtration with zero risk of trapping small fish or shrimp.
Filter Media
The media inside your filter matters. For biological filtration, ceramic rings or porous bio media like Seachem Matrix ($15 for 500mL) provide enormous surface area for beneficial bacteria. Activated carbon in mesh bags removes odors and some dissolved organic compounds, though it needs replacing every 4 weeks. A good foam pre-filter pad handles most mechanical filtration and is cheaper to replace than cartridges.
Heating Equipment
Tropical freshwater fish, which covers the vast majority of commonly kept species including tetras, cichlids, danios, barbs, and livebearers, need water between 74 and 80°F. A heater keeps that temperature stable regardless of ambient room temperature.
The Eheim Jager TruTemp aquarium heater is one of the most accurate and durable options available. The 100-watt version (appropriate for 25 to 40-gallon tanks) costs around $30 to $35 and includes a calibration dial that lets you verify and adjust the actual temperature offset. It's fully submersible and made of shatter-resistant glass.
For a more budget-friendly pick, the Aqueon Pro adjustable heater is $25 to $30 for the 100-watt model and has an automatic shut-off if the water level drops below the heater. This is a useful safety feature if your tank is prone to evaporation.
A rule of thumb for sizing: 3 to 5 watts per gallon. A 55-gallon tank needs 165 to 275 watts. For larger tanks, using two smaller heaters (for example, two 150-watt units instead of one 300-watt) is safer because a single heater failure can't overheat the tank as dramatically.
Water Treatment Supplies
Getting water chemistry right is fundamental to fish health. Tap water is treated with chlorine or chloramine, both of which are lethal to fish and beneficial bacteria. You need to address this before water goes into any aquarium.
Dechlorinators
Seachem Prime is the industry standard. A single capful (5mL) treats 50 gallons, and the 500mL bottle ($17 to $20) treats 5,000 gallons total. Beyond neutralizing chlorine and chloramine, Prime temporarily detoxifies ammonia and nitrite, which makes it valuable during cycling and for managing emergency ammonia spikes.
API Tap Water Conditioner is a simpler alternative at $10 to $12 that just handles chlorine and chloramine without the ammonia detoxification. It's fine for routine water changes in an established tank.
Cycling Products
New tanks need to establish a colony of nitrifying bacteria before they're safe for fish. This nitrogen cycle takes 4 to 8 weeks without intervention. Fritz Turbo Start 700 is the fastest bottled bacteria product I've used, often completing a fishless cycle in 3 to 5 days when dosed correctly. It's available for $15 to $20 for a 4-ounce bottle and is worth every cent for the time it saves.
Test Kits
You cannot maintain a healthy freshwater tank without testing the water. The API Freshwater Master Test Kit ($25 to $35) tests ammonia, nitrite, nitrate, and pH using liquid reagents. These liquid tests are significantly more accurate than test strips, which frequently give false readings. During cycling, test daily. In an established tank, weekly testing catches problems before they become emergencies.
For a broader look at the tools that go with these supplies, check out our Best Online Fish Supply Store guide for where to source equipment at the best prices.
Lighting Supplies
Freshwater fish don't have the same intense lighting requirements as coral reefs, but they still benefit from a consistent day/night light cycle and enough illumination to display their natural colors.
Basic Fish Tanks
The Nicrew ClassicLED Gen 2 is a well-regarded budget light at $25 to $35 depending on size. It provides clean white light with a slight blue accent that enhances fish coloration, uses about 14 to 22 watts depending on the size, and attaches to tank rims with adjustable brackets.
For tanks that came as kits with included LED hoods, the included lights are generally adequate for fish-only setups. The Marineland Portrait LED hood included with many kit tanks is a good example.
Planted Tanks
If you want to grow live plants, you need more intensity and ideally a broader spectrum. The Fluval Plant 3.0 LED is the most popular choice among planted tank hobbyists, running about $150 to $180 for the 32 to 46-inch model. It includes a Bluetooth app for sunrise/sunset programming and independent control of white, blue, red, and green channels.
A timer is essential regardless of which light you use. Fish and plants need a consistent photoperiod, ideally 8 to 10 hours of light per day. Mechanical outlet timers work fine and cost around $8 to $10.
Food and Feeding Supplies
Fish nutrition is often underestimated. A varied diet keeps immune systems strong and brings out natural colors.
Staple Foods
New Life Spectrum Thera-A pellets are arguably the best all-around freshwater fish food. The small pellet size works for tetras, rasboras, and small cichlids, and the formula includes garlic extract as a natural appetite stimulant and immune booster. A 150-gram container runs about $10 to $13.
For larger fish and cichlids, Hikari Cichlid Excel pellets at $8 to $12 are formulated to reduce waste production and are a solid staple.
Supplemental and Live/Frozen Foods
Frozen bloodworms and brine shrimp from Hikari or San Francisco Bay Brand add protein variety and trigger natural feeding behavior in most species. A pack of frozen bloodworm cubes runs about $6 to $8 and lasts several weeks feeding 2 to 3 times per week.
Freeze-dried options like Tetra Freeze-Dried Blood Worms are more convenient but provide less nutritional value than frozen. They work as occasional treats, not staple foods.
For bottom-feeding species like corydoras, plecos, and loaches, Hikari Sinking Algae Wafers at $6 for 40 grams are a staple. These sink quickly and won't foul the water as readily as surface foods.
Maintenance Tools
Consistent maintenance keeps freshwater fish supplies working properly and the tank healthy.
Gravel vacuum/siphon: The Python No Spill Clean and Fill system ($35 to $45 for the 25-foot version) attaches directly to your faucet and makes gravel vacuuming and water changes dramatically faster. For small tanks or if a faucet connection isn't practical, a basic Lee's Economy Gravel Vacuum at $7 to $10 works fine.
Algae cleaning tools: The Mag-Float Magnetic Glass Cleaner uses a floating outer magnet and inner scrub pad. The Mag-Float 125 ($18 to $22) works on standard glass tanks up to 1/4-inch thick. A simple plastic-bladed scraper from any pet store ($5 to $8) handles more stubborn algae spots on the glass.
Dip net: A 6-inch net for catching and moving fish. Nothing fancy needed here, any $4 to $6 nylon net works.
Dedicated buckets: Two 5-gallon buckets marked "aquarium use only." Never use buckets that have held cleaning products, even if they appear rinsed clean. Around $6 each from any hardware store.
If you're looking at specific products across all these supply categories, our Oxygen Machine for Fish Tank Price guide covers aeration supplies in detail, including air pumps, air stones, and airline tubing.
FAQ
What freshwater fish supplies do I absolutely need to start?
The non-negotiables are: a properly sized filter, a heater matched to your fish's temperature needs, a dechlorinator (Seachem Prime), and a test kit (API Freshwater Master Test Kit). Everything else can be added as you go.
How often do I need to replace filter media?
Biological media (ceramic rings, bio balls, sponge) should never be replaced all at once. Rinse it in old tank water during water changes to remove accumulated debris without killing beneficial bacteria. Chemical media like activated carbon should be replaced every 3 to 4 weeks. Mechanical filter pads can be rinsed and reused until they begin to fall apart.
Do freshwater fish need a specific light spectrum?
For fish-only tanks, no. A standard white or daylight LED running 8 to 10 hours per day is sufficient. For planted tanks, a spectrum with peaks in the red (650 to 680nm) and blue (450 to 470nm) ranges drives photosynthesis more efficiently, which is why planted-specific LEDs include those channels.
Where's the best place to buy freshwater fish supplies?
Online retailers like Aquarium Co-Op, Chewy, and Amazon offer the widest selection and competitive prices. Local fish stores are worth visiting for livestock and for advice, and buying there supports the local hobby community. For bulk supplies like salt for salt dips or fertilizers, direct from the manufacturer or through large online retailers is usually cheapest per unit.
Wrapping Up
Fresh water fish supplies don't need to be expensive to be effective. Prioritize a quality filter, reliable heater, accurate test kit, and Seachem Prime as your core supply list. Build from there based on what your specific fish need, whether that's specialized food, planted tank lighting, or CO2 injection. Keeping it simple and doing weekly water tests and changes matters more than having top-shelf gear you're not using consistently.