The essential aquarium pet supplies for any freshwater or saltwater tank break down into four categories: filtration, water quality management, feeding equipment, and maintenance tools. Within those four areas, you can spend $50 on the basics or $500 on premium gear, and for most home aquariums the mid-range options from established brands like Fluval, Seachem, and Aqueon deliver the best balance of performance and reliability. Knowing what you genuinely need versus what's optional marketing saves a lot of money when you're setting up a new tank.
This guide covers each supply category with specific product recommendations, explains what to prioritize for different tank types, and addresses the common mistake of buying equipment that doesn't match tank size.
Filtration Equipment
Filtration is the single most important category of aquarium equipment. Without adequate filtration, waste accumulates faster than the nitrogen cycle can process it, leading to ammonia spikes that stress or kill fish.
Hang-On-Back Filters
For tanks from 5 to 75 gallons, hang-on-back (HOB) filters are the most popular choice because they're easy to set up, simple to maintain, and reliably effective. The AquaClear series from Fluval sets the standard. The AquaClear 20 handles up to 20 gallons, the AquaClear 50 is rated for up to 50 gallons, and the AquaClear 70 covers tanks up to 70 gallons.
What makes AquaClear filters consistently recommended is the large media basket that you can customize with different filter media types (foam, ceramic rings, activated carbon) rather than being locked into proprietary cartridges that you pay a premium for every month.
Penguin Bio-Wheel filters from Marineland are another reliable HOB option at a lower price point. The Bio-Wheel adds an extra surface for beneficial bacteria colonization.
Canister Filters
For tanks 40 gallons and up, canister filters provide more filtration volume and better mechanical filtration than most HOB options. The Fluval 207, 307, and 407 cover tanks up to 45, 70, and 100 gallons respectively. The Eheim Classic series (2211, 2213, 2217) is known for extremely quiet operation and near-indestructible reliability.
Canisters are more expensive upfront ($80 to $200) and require more involved maintenance, but they're quieter and handle heavier bioloads better.
Sponge Filters
For fry tanks, shrimp tanks, or quarantine setups, sponge filters are the underrated workhorse option. They cost $5 to $15, are extremely gentle on small livestock, and the sponge itself provides excellent biological filtration surface area. The Aquaneat corner sponge filter and the Hikari Bacto-Surge sponge filter are two well-reviewed options. Sponge filters require an air pump to operate.
Heating Equipment
Most tropical fish need water between 74 and 80 degrees Fahrenheit. Goldfish, white cloud minnows, and similar cold-water fish don't require heating in most homes, but they represent a small minority of aquarium livestock.
The Eheim Jager heater is the standard recommendation from experienced hobbyists for reliability and accurate temperature control. Available in sizes from 25W (10-gallon tanks) to 300W (100-gallon tanks). The Aqueon Pro Adjustable heater is a similar quality level at a slightly lower price.
Avoid cheap unbranded heaters from no-name sellers. Heater failures are one of the most common causes of fish loss, and the price difference between a reliable brand and a no-name unit is usually only $10 to $20, which is not a meaningful savings.
Water Quality Supplies
Dechlorinators and Water Conditioners
Seachem Prime is what most experienced fishkeepers use. It dechlorinates tap water, neutralizes chloramines (which regular dechlorinators don't handle), and temporarily detoxifies ammonia and nitrite, which is particularly useful during the nitrogen cycle. A 500mL bottle treats up to 2,500 gallons and costs around $10 to $12. That works out to less than half a cent per gallon of water changed.
API Stress Coat is a secondary option that also adds a protective slime coat to fish during transport stress.
Test Kits
Liquid test kits are significantly more accurate than strip tests. The API Freshwater Master Test Kit tests pH, ammonia, nitrite, and nitrate, covers 800 tests across all four parameters, and costs around $25 to $35. This is a non-negotiable tool for any new tank during the nitrogen cycle, and useful for troubleshooting water quality problems at any point.
For saltwater tanks, add the API Saltwater Master Test Kit for specific gravity, carbonate hardness (KH), and marine-specific pH ranges.
Fertilizers for Planted Tanks
Planted tanks benefit from liquid fertilizers that provide trace minerals and macronutrients. Seachem Flourish Comprehensive is the most widely used all-in-one liquid fertilizer. For heavy plant growth, adding Seachem Flourish Excel (liquid carbon) or an actual CO2 system makes a significant difference.
Feeding Equipment
Overfeeding is one of the most common causes of water quality problems. The right feeding tools and schedule matter more than most people realize.
Automatic feeders: For daily feeding, an automatic feeder like the Eheim Everyday Fish Feeder or the Hydor Automatic Fish Feeder rotates a drum of food on a set schedule. These are particularly useful for small pellets and prevent overfeeding by dispensing a precise amount. The Eheim model is more reliable than most in this category.
Feeding rings and clips: A feeding ring is a floating plastic ring that keeps flake food from dispersing across the entire surface. This reduces waste and helps you see how much your fish are actually eating. A clip-on feeding station does the same for blanched vegetables or gel food.
Feeding tongs: For bottom feeders and catfish, tweezers or feeding tongs let you place sinking wafers or gel cubes directly on the substrate in the fish's territory rather than hoping the food sinks where they'll find it before it dissolves.
Maintenance Supplies
Regular maintenance keeps the tank water stable and the fish healthy. The key tools are:
A gravel vacuum for weekly water changes and substrate cleaning. The Python No Spill Clean and Fill is the most efficient system for tanks 30 gallons and larger. For smaller tanks, any basic siphon vacuum works.
An algae scraper matched to your tank type (magnetic float for glass tanks, acrylic-safe pads for acrylic). The Mag-Float 30 or Mag-Float 125 are widely used and reliable.
Aquarium salt for freshwater tanks with disease-prone species like livebearers and cichlids. API Aquarium Salt in 16-oz or 65-oz containers is straightforward to use.
Dedicated buckets, separate from any household cleaning buckets, labeled specifically for aquarium use.
For a broader look at what separates good equipment from budget options, the best aquarium equipment roundup covers filters, heaters, and lighting in comparative detail.
Supplies by Tank Type
Community Freshwater Tank (20 to 55 gallons)
The standard community setup with tetras, danios, rasboras, and similar fish needs a reliable HOB filter, a quality heater, dechlorinator, and a test kit. Budget around $150 to $200 for quality equipment in this size range.
Planted Tank
Add to the community list: a specialized planted substrate (Fluval Stratum, ADA Amazonia, or Seachem Flourite), liquid fertilizers, and upgraded lighting with a PAR rating appropriate for plants (the Fluval Plant 3.0 or Finnex Planted+ for most setups).
Betta Tank (5 to 10 gallons)
Bettas need a heater, gentle filtration (a sponge filter or low-flow HOB), a lid (bettas jump), and a few hiding places. Don't put a betta in an unheated 1-gallon bowl; they need 76 to 80 degrees F consistently.
Saltwater/Reef Tank
Saltwater tanks add a protein skimmer, a hydrometer or refractometer for salinity measurement, reef-safe rock and substrate, and potentially a sump with a return pump. The equipment budget for a 40-gallon reef setup is typically $400 to $800 just for the filtration and circulation equipment.
Check the top aquarium equipment guide for curated recommendations across these different tank categories.
FAQ
What's the minimum equipment I need to start a 20-gallon freshwater tank? Filter (AquaClear 30 or similar), heater (Eheim Jager 75W), dechlorinator (Seachem Prime), test kit (API Master Kit), gravel vacuum, algae scraper, and a lid. That's the functional minimum. Lighting for a fish-only tank can be a basic LED hood from Aqueon or Marineland at under $30.
Is expensive aquarium equipment worth the price? For filtration and heating, quality equipment from established brands significantly reduces failure rates and livestock loss. For decorations and substrate, there's very little quality difference between a $30 bag of gravel and a $12 bag of similar substrate. Spend on equipment; save on aesthetics.
How often should I replace filter media? Biological media (ceramic rings, bio balls, sponge) should rarely be replaced. Rinsing it in old tank water every 2 to 4 weeks is sufficient. Carbon cartridges should be replaced every 3 to 4 weeks or when a smell develops. Mechanical foam pads get rinsed monthly and replaced every 3 to 6 months when they no longer hold their shape.
Can I use one filter for two tanks? No. Each tank needs its own dedicated filter sized appropriately for that tank's volume and bioload. Splitting a filter's output between two tanks compromises both and makes maintenance significantly more complex.
Key Takeaways
For any aquarium, the non-negotiable supplies are a properly sized filter, a reliable heater for tropical fish, a dechlorinator, and a liquid test kit. Beyond those four, the supplies you add depend on your tank type and fish. Seachem Prime, the API Master Test Kit, and the AquaClear filter series consistently earn the top recommendations from experienced hobbyists, and for good reason. Start with quality on filtration and heating, and you'll avoid the most common causes of fish loss for new tank owners.