Originally Posted by stripedsocks
What if the tank is in indirect sunlight? Like I keep the side of the window farthest from Pierre open, so the sun doesn't really hit his tank but you can still see it.
Do you have a light on the tank? If you have it on for too long that might be your problem. Try to keep it on less than 12 hours a day. I know that logically (at least this happens to me) you think that there is no way you could possibly have it one for more than 12 hours, but before I had plants my lights were on for 14-16 hours a day.