An algae bloom is the cause of the green aquarium water. Basically, we have to figure out why too much algae is growing in your fish tank. We’ll dive into the causes of aggressive algae growth and how to stop it for good.
Are You Overfeeding?
If you have food left over in your fish tank a few minutes after feeding you might overfeeding you fish. If this is part of the problem there is a pretty easy solution. Cut back on the amount of food you are feeding. Just make sure everything is eaten at each feeding.
Are You Doing Frequent Water Changes?
A dirty tank will quickly grow algae. Frequent aquarium water changes need to be done to keep algae under control. When nitrates levels get high, algae thrives. If you haven’t been doing water changes, you should start right away. You should also do some pretty large (25%-30%), regular water changes to get your green cloudy aquarium water under control fast.
Is Your Tank Getting Too Much Light?
Algae also thrives on light. Reduce the light and stop the algae growth. If you tank gets direct sunlight you should find a way to limit the light your fish tank sees. You might be able to just keep the blinds closed. If not, you should consider moving your tank if your green aquarium water is a big problem. You could also limit the amount of time your aquarium light is on. This can contribute to algae growth as well. Another short term option is to cover your tank with a blanket if direct sunlight is a problem. This really isn’t a great long term solution as you fish and plants need light as well. Once you get the algae problem under control, a regular maintenance schedule should be enough to keep things stable.
Chemicals as a Last Resort
There are chemicals that you can find at your aquarium retailer that will quickly kill off algae. The only reason I would shy away from them initially is so you can figure out the cause of the problem. If you do not find the cause, it won’t be long before you’ll see it show up again. I will say, if it gets too out of control, it’s not a bad option for a quick temporary fix. They usually work swiftly.