Get an abalone if you can (Haliotis sp.). I have two in my 120gal and they are hands down the best snail there is. In fact they are now the only snails (apart from some small hitchhikers) that I have in that tank and I've had turbos, astreas, trochus, nassarius, ceriths and a conch. At up to 3" they're quite large but they don't have a huge shell so they don't knock anything over and they wont get stuck on their backs. They also move quite fast (for a snail) and consume more film algae than any other snail I've kept.
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