Muni;4605612; said:Intense light from your lights or direct sunlight is the most likely cause as pointed out. Just do a 50%ish water change and clean the gravel and try to reduce the direct light.
That way you don't have to cycle the tank again. It'll save a lot of time and pain.
Long as he doesn't clean the filter, there shouldn't be any re-cycling. The BB will still be present even with a 100% water change. Just make sure there's no more chlorine in the water before you turn the filter back on. That would kill the BB.
