saw these guys at 3 am and am not sure if i should remove them or not. length on all critters is about 1/2 - 3/4 inches long/wide.

pic 1 is of a snail i have seen many times on my zoos. it looks like it may be eating them? pic actually is of 2 snails (smaller one attatched to larger one)



and these funky looking slug things.



underside shot