Tx guys, I agree its not a pest after having seen some others in a Masa members tank yesterday. Not a fan but palythoa , I was trying to keep quiet and not draw attention to my noobness so I didn't ask him :D. It escapes the death penalty!
Going to try get some clean up crew tomorrow, much as I would love a couple of hermits to go along with the snails not sure if I should get them but will see.