Anyone knows what this is? ID?

[Nano]

I had a few in my tank and found they were good algae grazers. Mind you I had a big spaghetti worm out break so I cut back feeding and haven't seen one in a few months.

[hkreefjunkie]

I actually have a aiptasia outbreak right now! giving me a headache! trying to kill them with aiptasia x but keeps coming back!

[mohammadali]

i have only one of this snail it eats all the alage

[hillegom]

They like to come out at night.
I have a few myself and they are harmless, eat algae and leftover food. So good snail in my opinion.