thanks for your inputAgreed. I'd be more concerned with macro clogging or jamming up the skimmer. You should have plenty of height to move it to the 20g long.
If I remember correctly from one of your other posts I think you said you have a section for live rock only?
I would used the tall tank as one big refugium with just a little rock and mostly macro. Then use the long tank for skimmer and return.
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