Snail ID please.

[acso151]

Please help me ID this snail/ mollusk. It has a shell on the top only that covers half of it. I just saw it spitting out about 15-20 puffs of white stuff. Could that be eggs/sperm? Or maybe just getting rid of toxins?

 

[Softhammer]

It was probably taking a number 2 and that look to be a type of abalone. Good find. Only problem with them is that they knock stuff over, otherwise awesome specimen.

 

[acso151]

My plate coral got one the other day. Could not close around the shell but got everything else. For awhile I had a ton of little ones now only a few larger ones. Don’t know how they got in but seem harmless. Thanks!