Just trying to understand things as not above taking someone else's ideas for my own use.
Having the overflow going into the reservoir, might have an issue of detritus settling out. I've tee'd off one of my drains into a separate refugium and since no filter sock, skimmer etc and BB, know it builds up so forced to siphon it out everyone and a while.
Reason asking about the standpipe is am interested in running a Herbie without an overflow chamber. Like the idea so I've played around with a 33g and a 1" bulkhead and seemed to work okay. Biggest thing was getting the height of the standpipe correct so the water level was where I wanted it. With only ~230gph found I had to have the standpipe 2.875" lower than the bottom of the trim (final level was going for). I had suface agitation and still worked okay but nothing like a surge device.
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