Hi i have not long had a puffer fish and he has been getting brown gung in the tank, on the glass on the rock on the gravel and i am having to clean it about 3 times a week. I started having the light on for about 6 hours a day but a slowly reduced it to about 4.5 as i wondered if it was the light causing the algae ( as i predume its that ) but then i thought that only green algae was caused by lighting. Help how do i stop this . :rant2: