upside down jellyfish

[monocus]

i have them in a 40 gal tank with 2 firefish gobies,some mushrooms and a turban coral(couple of crabs,snails& a tiger cowry.they are harmless and stick to the bottom of the tank,or the sides of the glass.they feed on light and maybe some phyto.i have handled them many times with no effects(unlike some corals or anenomies).as far as i'm concerned they are reef safe as they are not preditory.i also have about 50 in the tank ranging from 1/4 inch to 1 1/2 inches with more starting in other tanks.
once in a while they will move through the water collumn but most of the time they are on the bottom