Thanks. Establishing bio filter now... planning a trip to TL Reefs once it's up and running.
Flow is a challenge. I've got a 1900gph return pump, split to either edge of the short 'back' of the tank, and 2x 'Rossmont Mover' 3000gph flow pumps, one under each return line, aimed right down the glass. The flow pumps are attached to my Reefkeeper, and alternate once per minute. Flow is sufficient at the back end, might be OK in the center of the tank, and is a little less than I'd like to see at the far end. Nice, random currents, but not that strong. At the flow rates that I'm currently running, I'm moving sand around. I bought 'special grade reef sand', which has larger particle size than I'd normally use, and it's still blowing around some. Not bad, but some. As bio film builds up, it'll likely settle a bit... hopefully enough.
Water returning from the flow pumps is flowing down the center of the tank, which is where the overflows are, in a swirling, random pattern. I think it'll work out well, once it gets a little age on it. I can't say it's a strong current, but there's a lot of water moving... we'll see.
I've considered buying an MP40, drilling a hole in the stand shelf to run the wire through, and mounting it on the far end. Not ideal... I don't want the noise, and I don't want to look at it.... and I _really_ don't want to drill a hole in the stand surround. We'll see, but that's my very last option.