I only have a small clean up crew in my 65 gallon tank. 11 blue leg hermits 2 trocus snails and 1 cerious snail that was supposed to be a hermit crabs so a bit of a stowaway. My rock work has a small amount of diatoms Algae and haven’t noticed much green algae. Do I still need to add anything in the way of food? I’m trying to create my bio filter on the rock. My rock was dry rock with 60 lbs live sand.