depends what fish you have...
in our moonlite tank we have some barbs, some rummy noses and our plecs.
After say 1-2 hours after lights out (with moonlight on, tank and room lights out), if the mid swimmers arn't floating spookily in the same position (ie asleep) then it's too bright.
only the nocternal fish should be active with the moonlights on
![Wink ;) ;)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)