webcricket said:Fish do need to sleep, so it isn't a bad idea to have the light off during the night.
Since my tanks aren't planted I really only leave the light on when I'm at home to enjoy the fish - which translates to leaving it on between about 4PM and 9PM on work days and longer on off days.
KO Lo said:Some fish sleep in the day, and hunt in the night ...
:read: