I have a 75gal FOWLR
approx 80-90lbs of live rock that has a light coating of ditrus on it. I feed every other day and fish included o. clown, yellow tang, diamond goby, and 2 chromis. i try and siphon up as much as i can during partial water changes. My clean up crew consists of 6-10 hermits, nassarius snails, and some turbo snails. do i just need more crabs? and what happens to crabs after about 6months it seems like i am always adding crabs.