Our living room outside wall is basically large picture windows. All the light from the windows plus the two sky lights resulted in very green water once the tank was running. I got the UV sterilizer for the green water which quickly cleared up and never returned, but then noticed how quickly the fish healed from injuries. If it wasn't for the UV sterilizer, I'm sure I would have dumped in gallons of Melafix.Forgot to mention, the 36w is perfect for my 300 for its intended purpose... to keep down on green water. For some reason, maybe incoming light from windows or something, this tank will get the green tinge in the water. The UV has been a huge help and I never have green water anymore.


tail regenerated

lower lip regenerated also

