Is there a way to clean gravel substrate without vacuuming the gravel? I have a tank that is only a few inches above the floor and using a normal siphon does not work well. I have an Eheim Quick Vac Pro that I use on most of my tanks, but can't use it on this tank at the moment. Why? The substrate is loaded with baby assassin snails (and may soon have baby shrimp). May also have ember Tetra eggs too, as they've successfully produced fry in this tank. I used the Eheim on it last week and pulled 20+ baby assassin snails from the substrate. Oops. They've been moved to another tank that I dump my pest snails into. The pre-filter is catching most of the stuff in the tank, and the cherry shrimp are cleaning up a good amount, but there is still debris on the bottom. Any ideas?