Lil_Stinker;1106492; said:The top cube will be sealed.. the 55 will not... the tube will not have any holes above water level, therefore no air can get in. no air in, no water out..
durring cleaning, some air may enter & some water will fall, but just until the water level in the 55 is again above the highest hole.. once the 55 is re-filled, the pump will pull the air out...
So basically the sealed cube acts as a kind of vacum holding the water up. Cool, should be interesting to see once its done.