Aquarium and Fish Supplies

Aquarium and fish supplies cover everything from the tank itself to the tiny bottle of water conditioner you add at every water change. The short version: the non-negotiables are a properly sized tank, a good filter, a heater for tropical fish, lighting, substrate, water conditioner, and a test kit. Beyond those basics, what you need depends on the type of fish you're keeping and how involved you want to get with the hobby.

This guide walks through each category of aquarium and fish supplies, what matters in each one, and how to avoid the common mistake of buying low-quality gear that needs replacing in six months. I'll also point out where you can save money without hurting your fish.

Tanks and Stands: Starting With the Right Foundation

The tank is the obvious starting point, but size matters more than people expect. Bigger tanks are actually easier to maintain than small ones because the larger water volume dilutes waste more effectively and temperature stays more stable. A 20-gallon tank is a better first tank than a 5-gallon nano, even though it costs more upfront.

Glass vs Acrylic

Glass tanks are the standard for most hobbyists. They resist scratching better than acrylic, don't yellow over time, and are generally less expensive. Acrylic tanks are lighter and can be molded into curved shapes, but they scratch easily during cleaning and cost significantly more.

Aqueon, Marineland, and Tetra all make reliable glass tanks. The Aqueon Aquarium Starter Kit comes with a filter, heater, and light included, which can save money if you're starting from scratch, though the included equipment is basic and may need upgrading as you learn more.

Tank Stands

A 20-gallon tank full of water, substrate, and décor weighs around 225 pounds. Regular furniture isn't designed for that kind of concentrated load. A proper aquarium stand distributes the weight correctly and is built to handle the moisture that inevitably gets onto it over time. The Imagitarium Deluxe Metal Stand and the Aquatic Fundamentals Steel Aquarium Stand are two solid options in the $60-$100 range for standard tank sizes.

Filters: The Engine of Your Tank's Health

Without filtration, ammonia from fish waste accumulates quickly and becomes toxic. A filter provides three things: mechanical filtration (removing particles), biological filtration (bacteria converting ammonia to nitrite and then to less-harmful nitrate), and often chemical filtration (activated carbon removing odors and discoloration).

Choosing Filter Size

Always filter for at least the full volume of your tank, and ideally more. A filter rated for 40 gallons on a 30-gallon tank gives you margin. Under-filtering is one of the most common beginner mistakes. The Aqua Clear 50 is a reliable hang-on-back filter for tanks up to 50 gallons, with a large media compartment that you can customize with different media types. The Fluval 307 canister filter handles up to 70 gallons and runs very quietly.

For tanks 10 gallons and under, a sponge filter powered by a small air pump provides adequate filtration and is gentle enough for small or delicate fish. Pair one with a Tetra Whisper 10 air pump and you have a complete filtration solution for under $20.

Heaters and Thermometers: Maintaining Stable Temperature

Most tropical freshwater fish need temperatures between 74 and 82 degrees Fahrenheit, and saltwater fish often need it even tighter. Temperature swings of more than 2-3 degrees within a day stress fish and make them susceptible to disease.

A submersible heater with an adjustable thermostat is standard. The Eheim Jager TruTemp is highly regarded for its accuracy and auto-shutoff feature. The Aqueon Pro series uses nearly unbreakable shatterproof construction. Figure on 3-5 watts per gallon as a general sizing guide, so a 100W heater covers a 20-30 gallon tank.

A separate thermometer to verify the heater is actually hitting the target temperature is worth having. Digital thermometers like the Zoo Med Digital Thermometer give accurate readings for a few dollars. Heater thermostats can drift or fail, and knowing your actual temperature is the only way to catch it.

Food: Quality Matters More Than Quantity

Overfeeding is one of the fastest ways to foul a tank. Fish food that isn't eaten decomposes and drives up ammonia levels. Feed only what fish will consume in about 2 minutes, once or twice a day.

The type of food depends on the fish. Most community fish do well on a quality flake food like Omega One Freshwater Flakes or New Life Spectrum. Bottom dwellers like corydoras and plecos need sinking pellets specifically formulated for them. Hikari Sinking Cichlid Gold and Hikari Sinking Wafers are popular choices. Frozen or freeze-dried foods like bloodworms and brine shrimp make excellent supplemental treats that most fish respond to with real enthusiasm.

Decorations and Hiding Spots: More Than Aesthetics

Decorations serve a practical function beyond looking nice. Fish need places to hide to feel secure, reduce stress, and establish territories. A tank with nowhere to hide produces chronically stressed fish that are more susceptible to disease.

Live plants are the best decoration because they also improve water quality by absorbing nitrates and adding oxygen. Hardy low-light species like anubias, java fern, and hornwort work well even without CO2 injection or specialized lighting. For artificial decorations, smooth-edged ceramic caves and driftwood replicas work well. Avoid sharp plastic decorations that can tear fins on long-finned fish like bettas or angels.

Aeration through an air stone or airbar connected to an air pump also serves a function, not just aesthetics. Good oxygenation supports fish health and beneficial bacteria. For tank oxygen supply options, it's worth looking at the oxygen machine for fish tank price range to understand what different setups cost.

Water Conditioners and Chemicals: Getting Water Right

Tap water contains chlorine, and many municipalities use chloramines (chlorine bonded with ammonia) that are even more persistent. Neither is safe for fish. Seachem Prime neutralizes both in one dose of 1 mL per 10 gallons and also temporarily detoxifies ammonia and nitrite in an emergency.

Beyond the conditioner, a few other additives are worth understanding:

Beneficial bacteria supplements like Seachem Stability or API Quick Start speed up the nitrogen cycle in new tanks. Results vary but they genuinely help in many setups.

pH adjusters are often unnecessary if your fish are suited to your local tap water chemistry. Chasing a specific pH number with chemicals creates more instability than a slightly imperfect but stable pH. Know what your tap water tests at and choose fish that match.

Plant fertilizers become relevant if you keep live plants. Seachem Flourish provides trace elements, and Seachem Flourish Excel or liquid CO2 alternatives support plant growth without a full CO2 injection system.

Finding Supplies: Online vs Local Fish Store

Local fish stores (LFS) are valuable for getting fish and plants healthy and acclimated, and the advice you get from a knowledgeable staff member is genuinely useful. But prices on equipment and dry goods are almost always higher at a local store than online.

For equipment like filters, heaters, and lights, buying from a reputable online fish supply store typically saves 20-40% compared to local retail. Amazon, Chewy, and specialty aquarium retailers like Marine Depot and Aquarium Co-Op all offer reasonable prices and reliable shipping on equipment.

For fish themselves, buying from a reputable local store lets you see the fish before you buy and reduces shipping stress. Mail-order fish are an option for rarer species, but require proper acclimation and carry more risk than buying locally.

FAQ

What fish supplies do I need to start an aquarium? The essential supplies are: a tank with a lid, filter, heater (for tropical fish), thermometer, substrate, water conditioner, a test kit for ammonia/nitrite/nitrate/pH, fish food, and a light. A net and siphon for water changes round out the minimum toolkit.

How much do aquarium supplies cost per month after setup? Monthly costs for an established 20-gallon tank run roughly $15-$40, covering food, water conditioner, and filter media replacements. Major equipment is a one-time purchase unless something fails or you upgrade.

Can I use tap water for my fish tank? Yes, but you must treat it with a water conditioner first to neutralize chlorine and chloramines. Let the treated water reach room temperature before adding it to the tank to avoid temperature shock, especially during large water changes.

Do fish need a light on all the time? No. Fish need a consistent light cycle that mimics day and night, typically 8-10 hours of light per day. Using a timer so the light turns on and off automatically reduces algae growth and keeps the fish on a predictable schedule, which reduces stress.

The Bottom Line

The quality of your aquarium and fish supplies directly affects the health of your fish. Start with a good filter, stable heating, proper water treatment, and accurate testing. Get those right and the rest of the hobby becomes much more enjoyable. Buy the best filter and heater you can afford. Save money on décor and decorative extras. That's the formula that works.