This is probably a really stupid question but how in the world do I vacuum my sand without vacuuming up my sand? I usually don't worry much about it because the snails keep it pretty well turned over but I hade a pretty bad bubble algae bloom because high phosphates now my phosphates are back down and the bubble is falling apart and all over the bottom of the tank I have tried different diameter siphons with different size hoses and I get as much sand up the tube as I do refuse. Any tricks out there?