Alright I have a few questions when it comes to this, I use a like $14 siphon from petsuppliesplus to drain water from my tanks, and to vacuum my gravel and sand. However when I try to vacuum up all the crap none of it really seems to go through into the buckets, it falls back down out of the tube, Ive noticed the same thing in my 150g, I stir the sand up and wait a couple mins to let it settle so all the crap goes to the top of the sand and all I do is suck sand up, and most the crap just falls back down. Is there something Im doing wrong?