PRACTICAL AQUARIUM HELP
Aquarium Guides for Freshwater, Saltwater & Reef Tanks
A healthy aquarium starts with the right setup, stable water and livestock that fits your tank. Big Fish Aquarium’s guides cover the basics of planning, cycling, testing, stocking and maintaining freshwater, saltwater and reef aquariums.
Use this page to understand your next step, find the right products or connect with our team when your aquarium needs more personalized help.
New Aquarium Setup
Livestock Compatibility
Water Quality
Tank Maintenance
Find Guidance for Your Aquarium
Freshwater, saltwater and reef aquariums share the same basic need for stable water and consistent care, but their livestock, equipment and maintenance requirements can be very different. Start with the type of aquarium you keep or plan to build.
Reef & Coral Aquariums
Explore guidance for reef-ready equipment, water parameters, lighting, flow, coral placement and long-term care.
Freshwater Aquariums
Learn the basics of freshwater setup, cycling, live plants, community fish, feeding and routine care.
Saltwater Aquariums
Understand saltwater preparation, filtration, water testing, marine livestock and ongoing tank stability.
Start With the Aquarium Basics
Whether you’re planning your first tank or correcting an issue in an established aquarium, begin with these four foundations.
Plan Your Aquarium
Choose the aquarium’s location, size and purpose before purchasing livestock. Consider the adult size of the fish, the equipment required and the amount of ongoing maintenance you can realistically provide.
A larger aquarium may offer more water volume and stability, but it also requires more space, equipment and maintenance. Make sure the stand can support the complete aquarium and that electrical outlets and water access are nearby.
Helpful Checklist
Aquarium and properly rated stand
Filtration and circulation
Heater when required
Lighting appropriate for the livestock or plants
Water conditioner
Water-testing supplies
Substrate and aquarium-safe décor
Maintenance equipment
Cycle and Test the Water
An aquarium needs an established biological filtration system before it can safely support a full livestock population. The cycling process allows beneficial bacteria to develop and process waste inside the aquarium.
Test the water before adding livestock and continue testing after the aquarium is established. The exact parameters you need to monitor will depend on whether the aquarium is freshwater, saltwater or reef.
Avoid adding too many fish at once. A gradual stocking plan gives the filtration system time to adjust as the amount of waste in the aquarium increases.
Choose Compatible Livestock
Choose livestock based on more than color or appearance. Tank size, adult size, temperament, swimming level, water requirements, feeding habits and the species already in the aquarium all affect compatibility.
Research every fish, plant, coral or invertebrate before bringing it home. Some species require groups, specialized diets, additional hiding places or aquariums without aggressive tank mates.
When asking our team for recommendations, provide your aquarium size, temperature, current livestock and recent water-test results.
Build a Maintenance Routine
Regular maintenance helps prevent small changes from becoming larger aquarium problems. Your routine may include water testing, partial water changes, algae removal, filter inspection and cleaning aquarium equipment.
Avoid replacing or aggressively cleaning every piece of filter media at the same time. Beneficial bacteria live throughout the aquarium, including inside the filtration system.
Keep a simple record of water-test results, maintenance dates, livestock additions and unusual behavior. A written history can make recurring problems easier to identify.
Freshwater Aquarium Setup and Care
Freshwater aquariums can range from beginner-friendly community tanks to planted aquascapes and specialized cichlid systems. Your livestock should be selected around the aquarium’s size, temperature, water conditions and existing inhabitants.
Live plants can provide cover and a more natural environment, but their lighting, substrate and nutrient requirements vary. Choose plants that fit your equipment and experience level rather than selecting them only by appearance.
Test the water regularly, feed appropriately and watch for changes in behavior, appetite or appearance. Consistent care is more effective than waiting until the aquarium develops a visible problem.
Saltwater and Reef Aquarium Setup and Care
Saltwater and reef aquariums require consistent preparation, testing and equipment selection. Mix and stabilize saltwater before adding it to the aquarium, and confirm that temperature and salinity are appropriate for the livestock.
Marine fish, corals and invertebrates can have very different compatibility, feeding, lighting and water-flow needs. Research each addition and leave enough room for growth, territory and coral placement.
Reef systems may require closer monitoring of water chemistry, lighting and circulation. Make adjustments gradually and avoid reacting to a single test result without considering the aquarium’s overall pattern.
The Equipment Behind a Healthy Aquarium
Everything you need for a healthy freshwater aquarium.
Cleaning and Routine Care
Regular water changes, algae control and equipment inspection support healthier livestock and a cleaner aquarium. A repeatable schedule is easier to maintain than occasional major cleanings.
Filtration and Circulation
Filtration removes debris, supports beneficial bacteria and helps maintain water quality. Choose equipment rated appropriately for the aquarium and the type of livestock you plan to keep.
Water Testing and Stability
Testing helps you understand what’s happening before problems become visible. Track results over time and make changes gradually instead of chasing a single number.
Aquarium Guide FAQ
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The cycling timeline varies based on the aquarium, filtration, starting method and water conditions. Don’t rely on time alone. Test the water and confirm that the biological filtration system is functioning before adding a full livestock population.
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Testing needs depend on the aquarium type and livestock. Most aquariums require routine monitoring of the compounds connected to waste and biological filtration. Saltwater and reef aquariums may require additional testing for salinity and other water-chemistry measurements.
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Add livestock gradually. The right amount depends on aquarium size, filtration, fish size, compatibility and whether the biological filter is established. Adding too many fish at once can overwhelm the system.
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Many aquariums benefit from regular partial water changes, but the right frequency depends on stocking, feeding, filtration, test results and the type of aquarium. Use water testing and the aquarium’s condition to shape the routine.
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Compare temperament, adult size, water requirements, swimming level, diet and territorial behavior. Also consider the size and layout of the aquarium. Compatibility can’t be determined by species name or appearance alone.
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Yes. Provide your aquarium size, livestock list, equipment, recent test results and a description of the issue. Photos can also help the team better understand the aquarium before recommending a next step.
Still Not Sure What Your Aquarium Needs?
Aquarium problems rarely come from one factor alone. Bring your questions, photos, livestock list and recent water-test results to Big Fish Aquarium, or contact our team for practical guidance.
Professional aquarium maintenance is also available for homes and businesses across Chicagoland.
Build a Healthier Aquarium With Big Fish
Find freshwater and saltwater livestock, aquarium plants, testing products, food, filtration and trusted tank-care supplies online or at our Chicago store.