Friend or foe?

[56longroof]

This snail hitched a ride on some live rock. Is it a good guy or bad?

 

[TX_REEF]

that may be a whelk based on the shell shape, in which case, foe.

 

[56longroof]

Thanks. I'll pull him as soon as he shows up again.

 

[ISpeakForTheSeas]

This snail hitched a ride on some live rock. Is it a good guy or bad?

Yeah, red foot = red flag in this case:

The snail is likely a young horse conch - these are actually massive, predatory snails (they're really cool, but they will eat your other snails, clams, etc. - basically any gastropods would be in danger). The red foot is an incredibly distinctive feature, and the only other snails I know of from Florida with red feet (Peristernia spp.) are also predatory (though these guys are much smaller than horse conchs). So, even if the snails are not horse conchs (which they most likely are), you still probably wouldn't want them in your tank. They could make a really interesting addition to a sump or a predatory snail tank dedicated to keeping them though.

Edit: I meant to say mollusks, not gastropods (though gastropods are a kind of mollusk).

It’s important to note with horse conches that 1) they’re not actually conches - they’re very large predatory snails, and 2) they can grow to two feet in length.