I have a 55 gallon reef tank in the making. Right now I have a Rena XP3 (yeah, I know) which moves 350GPH, a Koralia that moves 750GPH, and another Koralia that moves 1,400GPH. That is 2,500GPH on a 55 gallon, or 45X turnover :eek2: I have noticed that when all are running, it is tough to...