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Product Guides
Petco Filters: Complete Aquarium Filtration Guide
Discover the fish tank filter system that’s right for your aquarium. Learn about mechanical, chemical, and biological filtration at Petco.
Updated on June 19th, 2026
Care Sheets
Essential Large Marine Fish Care Guide: Tank Setup, Diet, & Tank Mates
Learn how to care for large marine fish, recommended diet and habitat setup. Find the right food, supplies and equipment at your neighborhood Petco.
Updated on April 9th, 2026
Care Sheets
Master Small Marine Fish Care: Tank Setup, Food, & Compatibility Guide
Small Marine Fish are favorites with marine aquarists and includes a wide range of species.
Updated on April 9th, 2026
Care Sheets
Your FOWLR Marine Tank: Easy Setup Guide for Live Rock Fish
Learn how to care for Marine FOWLR Aquariums. These tanks have easier upkeep and require less testing and supplementation than a reef tank. You can keep many fish who would generally consume corals and invertebrates, making it a popular setup choice for more aggressive fish.
Updated on October 23rd, 2025
Care Sheets
Freshwater Community Fish: Care, Setup & Compatibility Guide
Learn how to care for freshwater community fish, recommended diet & aquarium setup. Find the right food, supplies & equipment at your neighborhood Petco.
Updated on April 9th, 2026
Vet Q & A
How much sea salt to mix for my saltwater aquarium fish?
If your are using a product such as Instant Ocean ( www.instantocean.com ) or Reef Crystals ( http://www.instantocean.com/Products/Sea-Salt-Mixes/reef-crystals-sea-salt.aspx ), then directions will be on the container. Other products may also include instructions. The amount of sea salt will depend on the specific gravity you desire. Ocean water, or water used in marine tanks, has a specific gravity of 1.025, so you will need to dissolve enough salt into a quantity of water to reach that level. You will need to allow for 24 hours to make sure the salt has completely dissolved. If you want a step by step guide, click the link below. http://www.saltwatersmarts.com/guide-to-mixing-saltwater-517/
Updated on September 24th, 2025
Vet Q & A
Is plant fertilizer safe for fish? What do I need for a planted tank?
When used as instructed, plant nutrients and fertilizers designed specifically for aquarium plants will not harm aquarium fish. Allow new aquarium plants to settle and establish themselves before adding any fertilizers. Use aquarium plant substrates such as CaribSea Eco-Complete Plant Substrate http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=9087 to get your plants established faster. Seachem Flourish Advance Natural Phytohormone Supplement http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=33890 will help stimulate root growth vital for overall plants health. Even though you have plants with low to moderate light requirements, be sure to use aquarium light specifically designed for planted aquarium use (sometimes called plant lights) and have the lights on between 10 and 12 hours a day. You may need to adjust the photoperiod (the amount of time the light is on) depending on how your plants are doing and to prevent unwanted nuisance algae growth.
Updated on September 24th, 2025
Vet Q & A
My fish is at the bottom of the tank, breathing slowly. What's wrong?
Thanks for reaching out about Nemo and including photos. There is no evidence of Ich in the photos. Have you tested water quality for pH, ammonia, nitrites and nitrates? Correct problems. If having difficulty breathing (slow gill rate) add an air stone. A veterinary visit is recommended to assess and provide a diagnostic/treatment plan. Good luck.
Updated on September 24th, 2025
Vet Q & A
Why does my fish float after water changes? Swim bladder disease?
Water quality can definitely contribute to swim bladder disease. Keep the water temperature between 78 F and 80 F. Use a small filter if you can to maintain water quality. When performing water changes, use aged or conditioned water that is temperature matched to prevent stress or shock. Keep a large container of water out for 24-48 hours prior to use. This "aged" water can then be conditioned with StressCoat, NovAqua or similar conditioner prior to changes. Use no more than 1 teaspoon aquarium salt per gallon of water as a general tonic.
Updated on September 24th, 2025
Vet Q & A
High nitrites in new fish tank, and my fish won't eat. What's wrong?
Thanks for reaching out. Sounds like new tank syndrome, which is the time it takes for the biological filter to come up to speed, reducing ammonia to nitrites to nitrates. Continue to test and perform water changes as needed, giving the filter time to establish. Good luck.
Updated on September 24th, 2025