API Saltwater Test Kits & Water Care

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New Pet
Build Your Thriving Saltwater Tank: Easy Setup for Marine Life
Learn how to set up a saltwater fish tank and key considerations regarding placement, supplies needed, and the overall set up process.
Updated on November 13th, 2025
New Pet
Mastering Soft Coral Care: Setup, Feeding, & Water for a Healthy Reef
Learn how to care for soft coral, recommended care & habitat setup. Find the right food, supplies & equipment at your neighborhood Petco.
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Home & Habitat
Your Guide to Healthy Freshwater Aquarium Plants & Thriving Fish
Learn how to pick the right aquarium plants, substrate, lighting, and fertilizers to ensure that your aquarium plants thrive and stay healthy.
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New Pet
Perfect New Fish Tank: Water Quality & Cycling for Healthy Fish
Before establishing an aquarium at home, learn more about the basics of fish care.
Updated on November 13th, 2025
New Pet
Your Ultimate Tang & Surgeonfish Guide: Tank, Food & Habitat
Learn how to care for a tang fish, recommended diet and aquarium setup. Find the right food, supplies and equipment at your neighborhood Petco.
Updated on November 13th, 2025
Health & Wellbeing
Two of the fish fins are clamping down close to their body. I did 75% water change and hopefully they will get better. I do not have the water testing kit. Will buy soon. Is there any ways to get them better? I could see some of their scales are off.
Goldfish need powerful filtration. Your filter should be rated for at least twice the tank volume. Once you get a test kit, check the chemistry. Aim for 0 ppm ammonia and nitrites with nitrates at about 40ppm. Use a kit that has liquid reagents, not strips. The liquid kit is more accurate. The pH should range between 7.2-7.6. Being cold water fish, goldfish thrive between 65F and 72F. You can dissolve 1 teaspoon of plain aquarium salt (NOT table salt) per gallon of water to use as a general tonic. It will reduce stress, improve gill function, treat minor infection and aid in recovery. Treat for 10-14 days then reassess the condition of your fish. When performing partial water changes, treat only the volume of water being replaced not the entire tank volume. Change no more than 30% of the volume at a time. Use only aged or conditioned water that is temperature matched to prevent stress or shock.
Updated on August 12th, 2025
Health & Wellbeing
I'm about to buy some new fishes mostly Tetra Can you help me what fish should I buy because I am beginner in this things. Please tell me what sort of things I should bring I have a one foot tank now other than that What should I purchase from Aquar
Before you buy any fish, you will need to set up the tank. A basic set up includes: a tank, filter, hood/light, heater, gravel and some decor. The tank should run without fish for at least 4 to 6 weeks. This gives it time to cycle. The Nitrogen Cycle is critical to the health of the tank and any fish you will be keeping. During this time, beneficial bacterial will populate the filter and substrate (gravel). These bacteria will be responsible for breaking down fish wastes and other wastes (uneaten food, dead plants, etc.). You will need a home test kit to monitor water chemistry (ammonia, nitrites, nitrates, pH) or you will have to submit water samples for testing. Most pet stores will do this for free or for a small fee. At first, you will see high levels of ammonia and nitrites. Over time, as bacteria grow, these levels will drop. When ammonia and nitrites are at 0 ppm and nitrates are below 20 ppm, you can consider adding fish. Regular (every 1 or 2 weeks) partial water changes as we
Updated on August 12th, 2025
Health & Wellbeing
We are new to having aquariums, we really didn't realize so many things played a factor with the water. We currently have a 10 gallon tank but want to increase to a 29 gallon tank. We currently buy gallons of water but with the 29 gallon tank we real
Water softeners leave very little salt residue in the treated water. Most, not all, fish *should* do fine in softened water. Make sure you get species that does better in soft water. Use a hardness kit and monitor KH. This parameter is what can affect pH. You can set aside a gallon or two and test it after it has aged for 24-48 hours to confirm it is safe to use. Check the softener unit for a bypass valve. Some units will have one or you can get one installed. Taps/faucets outside may not be in line with the softener, so you can use water from there if necessary.
Updated on August 12th, 2025
Health & Wellbeing
Hi there! Having a few questions: i dont know what is happening, all of our fishes are always dieing. I would like a fish expert answer. What is happening to these blue fishes? On their skin there are multiple grey spots, and another fishes are getti
Check the water chemistry. The discoloration could be due to elevated ammonia levels which can cause "burns". Use a home test kit or submit a water sample for testing. The local Petco may do this for free or for a small fee. Aim for an absence (0 ppm) of ammonia and nitrites with nitrates at 20ppm or less. Perform partial water changes to stabilize chemistry and/or to improve water quality. Use only conditioned water that is temperature matched to prevent stress or shock. The Neons (blue fish) appear to be infected with Ich, a parasite. Treatment is possible with commercial products found in the local Petco. Follow label directions carefully. You will need to treat the entire tank until all traces are gone. Removing a lump from your fish on your own is never recommended. You can cause severe injury. Most broad spectrum antibiotics (Kanaplex, Maracyn, Maracyn 2, etc.) found in the aquarium section of the local Petco should help treat or prevent infection. Choose one and follow label d
Updated on August 12th, 2025
Health & Wellbeing
My fish swims to eat but then goes back to the bottom of the tank and stays there, I am treating him for ich too. His breathing is slow and steady but he just stays at the bottom of the tank. His friend died a few days ago too, could he be lonely ?
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 August 12th, 2025