I have a JBJ nano-cube 28g I'm going to set up while I buy all new equipment for my 75 gallon tank . My question is how many times per hour should your return pump flip your volume of water? I am looking at the eheim compaction 600 for the nano cube but for this set up would require 2 of them. They push 159 GPH, or if anyone has a better recommendation I would appreciate it. Thank you for any advice