Hi Cecil,
Why don't you treat your RBC tank as a sump tank into which both of your fish tanks drain?My guess is, if the RBC tank is level, and the outflows are the same diameter pipe at the same level, the flow should be equal going to each tank and any adjustment with a valve will not be needed.
A single pump would be located in the sump (along with the RBC) and would only require a couple of valves to regulate the flow from the sump tank/pump into the two fish tanks.
Of course, you could also insert a nice little wedge wire filter (like those Kellen designed)....and a brush filter (or some other means of trapping the suspended solids.......between the fish tanks and the sump tank.
Gary


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