i have bed of small rocks (big enough so my turtles cant swallow) in my aquarium and im trying to find out which graval type vac works well. i purchased one of those graval vac that i need to shake really hard to suck the crap and water from the bed of the aquirium but it ended up just sucking out water and nothing else. is there a siphon vac that works well with small rock beded aquarium? i really want to clean out the food/poop/etc thats trapped in between the rocks to give my turtles the clean water they rightfully deserve.
lastly, does the battery operated graval vac work better than the ones you have to manually shake?



