I have a glass bottom tank with no gravel or anything, except gunk. I want to know if a gravel vacuum would clean up after my turtle and goldfish, because no matter how many PWC
and cleaning of the filters there always seems to be junk/poo on the ground! I also want to know if the number of gallons that can be filtered "up to ___ gallons" is addable? The tank that I got came with 2 elite stingray filters and a fluval 2. I want to add more but how much is being "filtered"?