i was just looking in my fuge today and saw some sort of shrimp in there there are about ten of them in there. they are clear and are only about 5mm long (the biggest one i saw) but i am just trying to grow chaeto in there and have not seen any in my display or sump so are they dangerous? also i saw some snails and there is some sort of egg sac on my glass all are clear i will try to get some pics.