Keeping tank clean with a trigger

[Twisted-1]

I had the same thing with my picasso and hermit crabs. The crabs hid during the day to come out at night. I actually thought that all my crabs became snacks but to my suprise I found almost all of them running around one night. I would try to add them during the night so the Trigger doesn't see them enter the tank like a snack. I had blue legs and afew scarlets in with mine.