Two things.
1. The narrowness of the baffles might cause higher waterflow rates which might pull bubbles right past. Hard to say for sure though, it might be just fine too.
2. I'd go with one pump, a slightly larger one for the return and tee off it with a ball valve to feed the refugium. You can adjust the flow to the refugium to tune the amount of return flow to the tank that way.
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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