Not sure how many gallons he's in (pretty boy btw)...OR the size of the snail....
I have one in a 3G w/ a fairly big snail (ramshorn), and he never messes with it.
My other's all have pond snails in with them (hanger ons from live plants), and they sometimes
will knock them off the glass. But they are still alive.
They don't really need a tankmate to be happy, YOU are their best friend!