Thanks guys, yes I want to oscillate them, Roger.
Rouselb, I just don't have the random flow pattern that I desire.
I don't think the mag18 that I have for a return from sump would make a dent in the flow on 2 WS.
I have a 6101 in the back middle as well--it is pulsing 0-100% every 8 seconds, and gives pretty good randomness, but I need more to make my SPS flourish.
I suppose a wavebox is the other option?
This is only a 120g 4' tank, pumps ae on full blast (except the 6101) and I still can't get decent flow to a couple of colonies.
What do you think, Roger?
Thanks all, Rodney