08-26-2008, 11:18 PM
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If you don't have any other invertebrates in the tank, there's no need for a quarantine period as diseases and parasites carried by inverts can't be passed to fish.
The snails eat any sort of detritus they can find in the sand. Uneaten food, fish waste, decaying plant matter, algae, microbes, any sort of thing.
I've got the kuhli loaches in my tank now, but I've seen them cruise right on by snails without touching them. From what I've heard, they're one of the few loaches that won't eat snails. So, my snail population has no predatory check on it, it's just limited by how much food there is to sustain them. Every once in a while I see them crawling on the glass or rocks, but I've never seen them touch my plants. They keep my sand pretty darn clean, though. If there's some uneated pellets or some fish poo on the sand, it will be gone in no time flat.