i have a 90 gal with a standard 2 ,32watt aquarium lamp set up.. and i felt it just worked .. too well... everything was so well lit that it seamed fake so i got some green cellophane and put it around the lamp. it makes the tank look amazing, with a kind of murky effect. but im not sure how it will effect the fish(if at all) and algae growth. it may look cool but if it harms my fish then its pretty pointless...any ideas/misshaps on the subject would help greatly.. thanks