I currently have a 37 gallon with a quite one that pushes 496gph but is turned down to about half. I have two maxi-jet 600's for added flow in the tank controlled by an rk2. I was looking to upgrade the maxis to koralias, and i cant decide if i should get the koralia nano (240 gph) or the koralia 1 (400 gph). the maxi's currently cycle on and off every 30 minutes during the day, and 1 hour at night. Any suggestions?? Id also consider any other pumps you guys recommended too. Thanks!