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Chicagoland Aquarium Guides: Freshwater & Saltwater Care

  • A school of small, colorful fish swimming in an aquarium with dark background.

    Oak Park's Guide to Freshwater Aquariums

    Big Fish Aquarium in Oak Park is your local source for healthy freshwater tropical fish. We stock high-quality angelfish, plecos, cichlids, livebearers, and tetras. Whether you are setting up your first freshwater tank or running an advanced Chicagoland aquarium, we have the livestock you need.

    Plan Your Freshwater Tank
  • Colorful underwater scene featuring orange and purple sea anemones with a few fish swimming nearby, including a striped fish and a blue fish.

    Saltwater Aquarium Essentials for Chicago Hobbyists

    Setting up a saltwater tank in Chicago? Big Fish Aquarium in Oak Park carries a massive selection of marine livestock and essential aquarium products. We have everything you need to run a successful local reef system.

    Learn Saltwater Basics

Oak Park Freshwater Aquarium Builds

Underwater view of lush aquatic plants with green and reddish-purple leaves, some with long stems, in a vibrant aquarium.

Live Aquatic Plants for Freshwater Systems:

Live plants do more than just look good; they are active filtration for your tank. Adding aquatic plants naturally balances your ecosystem by generating oxygen, pulling CO2 out of the water, and locking in your pH levels. Read our complete guide to building a stable planted tank and keeping your livestock healthy.

Read the Freshwater Plant Guide
A small red fish swimming among green aquatic plants.

Healthy Freshwater Fish Shipped Nationwide

Tropical fish need space and stability to maintain their vibrant colors. We recommend a 20-gallon tank minimum with solid filtration and a steady 74°F to 78°F. Big Fish Aquarium provides healthy freshwater livestock for hobbyists across the country. Check our live availability and get premium fish delivered straight to your setup.

Shop Nationwide Freshwater Stock
Shop Nationwide Freshwater Stock

Chicagoland Saltwater Reef Essentials

Bright green and pink stony coral with fluorescent tips on a grid system underwater

Tropic Marin Water Chemistry Supplies

A healthy marine tank comes down to the numbers. You need zero ammonia, perfectly locked salinity, and balanced calcium and magnesium levels to maintain your ecosystem. Take the guesswork out of your maintenance routine. Shop our Tropic Marin catalog for professional grade lab tests and additives to keep your saltwater parameters rock solid.

Shop Tropic Marin Products
Underwater scene with a black fish swimming near a large, colorful coral and other marine life.

Essential Saltwater Testing Supplies

Don’t guess with your reef. Regular water changes remove toxins, but maintaining strict water quality requires accurate monitoring. We carry the exact saltwater test kits, trace minerals, and water conditioners you need to keep your tank stable. Shop our testing catalog and get your numbers right.

View Testing & Additives Catalog

Chicagoland Aquarium Maintenance Services

Local Maintenance: Essential Products & Services in Oak Park

A successful tank requires strict water stability. Big Fish Aquarium has spent 25 years mastering Chicago's unique water chemistry. If you want to stop fighting your pH and alkalinity, offload the technical testing and routine maintenance to our local specialists.

Book Oak Park Tank Service
Book Oak Park Tank Service