Spend the money on a larger clean up crew. Its worth it. For my 46 i got 10 nassarius snails, 10 turbo/astreas, 1 mexican turbo, 20 blue leg hermits, 2 emerald crabs. The peppermint shrimp wont eat zoos. Not that i have seen or heard. For the diatoms i hear cerith snails love them. I would look...