@Raege gets awesome flow with 1 gyre and a pulsing powerhead opposed. @Fudsey does this as well if I recall. I'm sure he will correct me if not.. Something to consider anywho... 2 gyres is a lot.Looking good. It is in the back, deep in the flow, so hard to get a picture. If I can find the time this weekend I am going to add the second gyre and get a real maelstrom going in there.