We have quite a few filter feeders right now and I give them a varying diet of phytoplex, chromaplex, microvert, baby brine, zooplex, and every once in awhile a little coral accel
I have tons of filter feeders that are gorwing and spreading. Do not polich the water. You want some organic particles in the water --that is their food. Some people polish the water until its crystal clear --and no food for filter feeders.