Wow some of your tanks are flowing alot of water, 3000 in a 75? Thats alot more than it needs. Im setting up a 210 shark tank (The filtration is going to be a total of 1700 gph, and the power heads will be pushing a total of 690 gph.) So my total of filtration will be x8 (6-8 is the recommended amount needed to filter a tank) and total water movement will be 2390 gph which is x11 the total tank size.