Why is my fish tank water turning green after a few weeks, what to do?

Question

Why does my water turn green after 2-3 weeks? No live plants and 1 artificial log in the tank!

Andrea M. Brodie, DVM · Accepted Answer

The green you see is algae. These like nutrition-rich water and lots of light. So you are probably feeding your fish too much and they are not eating all the food. Also there may be too much day light reaching the tank. I suggest you cover your tank in such a way that most of the day light is removed. Fed your fish sparsely. That means, only feed what they can and will eat within one minute. Get some algae-eating fish like a small pleco. Also change about 1/3 to 1/2 of your tank water to remove some of the algae floating in the water.

Why is my fish tank water turning green after a few weeks, what to do?

Most Helpful Answer

Share