<a href=showthread.php?s=&postid=11312529#post11312529 target=_blank>Originally posted</a> by mpdharley
My tank is 6x4x2 (320 gallons, give or take) and two was not enough for it. I've added a third and may add a 4th. However, I'm going to wait awhile before I add the next one.
The side that has two pumps has one in Reef Crest mode and the other in Lagoon. Both are placed about 12 inches in from their respective sides.
The third one is on the opposite wall, about 18 inches in from one side, about half way up, and it is running in slave mode, anti-sync to the Reef Crest pump on the other side.
I do definitely prefer these to the closed loop that I have in the tank. In fact, I'm taking out all of the piping for the closed loop and definitely like the "new" look! It will also give me a backup pump for my return (both were using a Dart pump).