snail selection?

[niloc16]

to reduce my lighting will also effect my corals,no? also i thought stopping feeding of the fish but how long can they go without food. i was thinking feeding every third day for awhile to see if it helps but i dont the fish to suffer. any suggestions for detritus cleaners? i thought bumble bee and nassarius would do the trick but not by the sound of the response, by the way thanks for the info everyone