Resident Aquarium Nerd
Join Date: Apr 2004
Location: Murfreesboro, TN
Snails can't hurt your platies and can actually be somewhat beneficial (they'll eat uneaten fish food before it has a chance to rot, stir your gravel, clean the glass, etc.). So I wouldn't freak out and try to get rid of them unless they really bother you or you have live plants (some pest snails eat live plants, some don't...depends on the species of snail).
I'm not a fan of adding more animals to a tank just to take care of a problem like that and I personally wouldn't add assassin snails or loaches at this point. The thing is, snails don't just appear out of thin air. In order to breed, they're going to need to eat. If there's enough uneaten food and debris for them to multiply out of control, something is wrong with the balance. You need to do more water changes, limit the amount of food you throw in the tank, and vacuum the gravel more thoroughly. That, IMO, is the best way to control a snail population like that.
If you're desperate to get rid of them really fast, any copper-based medication/snail killer will kill them quickly. Just keep in mind, though, that copper will kill other invertebrates (shrimp, crabs, etc.) too and harm certain plants. Once you've used copper in a tank, you should never add invertebrates, even after cleaning the whole tank out. A small amount can kill. There are also a few fish that are sensitive to copper (cory cats and loaches, for example). Be careful in using any chemicals.
"We weep for a bird's cry, but not for a fish's blood. Blessed are those with a voice."
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