THEY BLOW THEY BLOW THEY BLOW. or maybe I should say THEY SUCK THEY SUCK THEY SUCK. Well, after a while the really blow and suck. I checked it for crabs or snails and everything seemed fine. Maybe I am over looking something. I have heard good things about them, buyt in the heat of the moment when my tank was all over the floor I was tempted to throw it in the fire place and let it burn burn burn. It was quite the freak show at my place last night.