I am just about to buy some powerheads for the new tank. The setup I am planning is MASSIVE water movement! What I have in mind is 2 Seio M1100's and 1 Seio M820. That is 43 x turnover in my 70 gallon tank. Is that to much? Please note they will be on a wave machine so they won't all be on at the same time to often. What are considered the highest number of turnover that is acceptable? Thanks, DIRT