Lights came on and I found this little snail attached to one of my power heads. No idea what type it is, but it definitely isn't something I purchased. It's shell only covers the top half. It cannot retract into it's shell. Looks a lot like a slug. It moves pretty fast to for a snail.

IMG 1288 - I.D. Help!
IMG 1289 - I.D. Help!
IMG 1306 - I.D. Help!
IMG 1298 - I.D. Help!
IMG 1306 - I.D. Help!