What are your cleanup crews? Especially the 450 crews.
Species and quantity.
I think I started with 10-15 hermits, 28 nerites, 23 nassarius, 70 dwarf ceriths and 33 Florida ceriths. Bought a few trochus snails after that and a fighting conch. All the nerites are dead, worthless anyways, they just hang in a corner or crawl out of the tank and end up on the floor (several made it into the sump.)