My Half in, half out of wall 330 starfire build.

[gregzz4]

Maybe others have better luck than I, but I had too much trouble adjusting reactor flow rates off of one common pump
Adjusting one would mess with another, or the return flow
This would be an even bigger issue during maintenance

Mine hang in the sump, and I ended up using individual powerheads and a T with valve on each for flow adjustments