What is this thorned snail???l friend/FOE?

[mark]

and a nice looking one.

[Marlin65]

I have a few of those they normally come out when the lights are off.
They also grow fast and in my tank they look like they are multiplying.

[justinl]

ah there ya go. yeah definitely a sweet looking creature. a lot more elongate than the chitons Im used to.

[banditpowdercoat]

OK, how do you pronounce it?

ch-i-ton with heavy I sound
or
chit-on like the poop slang?

or chi-ton chi like Tai-Chi ?