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Fluval Algaecides & Water Clarity
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- Training & Behavior
Finally! 10 Easy Ways to a Crystal Clear, Algae-Free Fish Tank
Our top ten most important tips for removing and keeping algae out of your aquarium.
Updated on October 29th, 2025
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Saltwater Cleanup Crew: Banish Algae, Keep Your Tank Pristine
Visit Petco to learn about cleanup crews and how they can help your aquarium health.
Updated on October 29th, 2025
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Aquarium Water Quality: Master Healthy Fish & Crystal Clear Tanks
Learn how to test your aquarium water. Poor water quality stresses fish, which leaves them susceptible to disease and possibly death.
Updated on October 29th, 2025
- Health & Wellbeing
Cloudy Fish Tank? Find Causes, Get Crystal Clear Water & Happy Fish!
Have cloudy water in your fish tank? In order to clear up your water, first you need to understand the potential causes to apply the correct solution.
Updated on October 29th, 2025
- New Pet
Master Aquatic Plant Care: Lush Aquarium Plants & Happy Fish
Tanks with live plants can be excellent additions to your home, bringing a touch of nature indoors. Learn how to take care of aquatic plants.
Updated on October 29th, 2025
- Health & Wellbeing
My fish tank got infested with pink algae and green algae and the fish are acting lethargic and dying.
Check the water chemistry using 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. Rinse the filter media in tank water, not tap water, and replace it. Use only conditioned water that is temperature matched to prevent stress or shock. To limit algae growth, maintain pristine water quality via filtration and regular water changes. If possible, turn up filter flow to keep water moving. If this stresses the fish though, do not do it. Do not overfeed and remove any uneaten food promptly. Limit lighting to 8 hours daily and closely monitor water temperature as well. All these can promote algae overgrowth.
Updated on August 12th, 2025
- Health & Wellbeing
My fish tank is getting brown on the decorations and gravel I tried cleaning it a couple days ago but came right back
Brown algae overgrowth can be due to high nitrates, too much light or overfeeding. Use a liquid home test kit or submit a water sample for testing. Most pet or fish stores will do this for free of for a small fee. If nitrates are over 40ppm, it can be decreased by performing partial water changes. Use only aged or conditioned water that is temperature matched to prevent stress or shock. You can also use a nitrate absorbing filter insert. The algae will need to be physically scrubbed from plants or rocks and can be scraped from glass. Rinse filter media using tank water NOT tap water. Limit light to 6 hours daily, 8 if you have live plants and do not over feed.
Updated on August 12th, 2025
- Health & Wellbeing
I have recently used medication in my 50 gal freshwater fish tank with one 22 year old comet goldfish in it . the meds cured my fish but must have killed my beneficial Bacteria as now my established tank has been going through another nitrogen cycle.
Thanks for reaching out about Fishy. A UV sterilizer will only help if a bacterial component is adding to the cloudiness. More intense water changes are the best way to remove nitrates. Monitor feeding to limit excess, vacuum bottom of tank to remove degrading detritus. Good luck.
Updated on August 12th, 2025
- Health & Wellbeing
Concerned about what possible skin diseases?? Some of my fish possibly may have. Is it a possibility that some just algae on them. I recently treated the tank with copper sulfate because I believed that fish may have velvet.. however two days later;
Thanks for reaching out. Have you tested water quality for pH, ammonia, nitrite and nitrate. Correct problems. Don't see any signs of external lesion on the pictures, except fine erosion, and possible gravid fish. A veterinary visit is probably needed to trouble shoot for disease. Randomly adding chemicals to the water could have detrimental effects. Good luck.
Updated on August 12th, 2025
- Health & Wellbeing
Can I use Algecide for fish tanks in his tank? There is a lot of algae growth on the rocks and on the side of the tank. Is there any other advice to help me remove it?
There are different ways to control algae accumulation inside the tank: Limit the nitrate accumulation in it (regular water changes is the most common method of removing nitrate), limit the lighting period in the aquarium (4 hours a day) avoid overfeeding. Try Algone, very effective against nitrate, it is not an algaecide but it can control indirectly algae. If all these methods are not effective, algaecide are then needed.
Updated on August 12th, 2025
