Yep, I'm going to pull the rest of the bioballs out. Now that they are floating and I can reach them!
Ok, I'll cut some of that tubing off the return side. There is a half-loop of extra tubing that can come off. I put a ball valve on the return too, just in case I needed to throttle it back some.
I've got lots of powerheads. Right now there's a Koralia in there and one small PH in the center. With the 3 of them I get lots of water movement, none of it laminar and my corals all seem very happy with it. But the return flow does push sand out of the corner, and I haven't been able to adjust it so that it doesn't blow sand somewhere. So now I'm glad I put that ball valve on there.
Now I have to ask: to me, adding back pressure against the pump seems counter-intuitive - and it would burn the pump out faster. Why would that not be correct?
I guess everyone already knew that the overflow was going to sound like Niagara Falls in our TV/Family room, right?