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Supurderek nailed the ID - it's a murex.
They're predatory, feeding on clams, other snails and occasionally corals, from what a quick google search tells me.
This guy won't eat your algae ... but he'll happily dine on those snails which do.
One of those times when an inexpensive snail isn't a bargain, I'm afraid.
~Bruce
That, I'm afraid, isn't a decision I can make for you.
~Bruce
It's a cool snail, one I've never seen in an aquarium store.
It's also a predator.
If you can get it back to your LFS, they may be able to find a home where it's welcome.
~Bruce
That could work!
He's probably well-armored enough that your fish won't bother him...
~Bruce
Copper tends to be pretty toxic to invertebrates. Probably not a good idea.
~Bruce
Alas, we're back to questions only you can answer meaningfully . . .
If you can get your parents to return you (and the murex) to the LFS within a week or so, you can try stowing him in the back chamber of your tank.
If you put him into your FOWLR, you're likely to end up with a nice seashell ... and a bit of ammonia in your tank.
Those seem to be the available options, from here . . .
~Bruce

