Hi all -
I bought a 120 gallon tank in November and decided to make it a low tech, planted. I did a ton or research and things seemed to be going well, but within the last two weeks, my water has turned very green! My fish seem to be perfectly happy, but it's becoming an eyesore.
The water hasn't changed... Nitrites and nitrates are under control. The water is soft, acidic and untreated (well water). I've tried ~25% water changes, and it clears up for about 12 hours and then is thick green again.
After some reading, my best guess is that the tank is getting too much natural light (perpendicular to a south facing window). If that is the case, is the only option a UV sterilizer? Or is there something else I should try?
From what I've read, a black out might clear it up, but the natural light will just cause it to come back???
Any help would be greatly appreciated - I still have quite a bit to learn Thanks!