Seriously!!! You missed the "ASIAN" part.I hope this is a joke! Seriously a RTC in a 20G sump!!!
Run your drains into filter socks and the fish stay in the sock.
If your overflow is strong, any fish trapped in the filter sock will be dead with the strong splashing. My overflow pushes approx 800-900 GPH, didn't use a strainer drain in the top of overflow pipe, as I was experimenting with maximizing my water output. Found a 3" dead cichlid in the filter sock, splashed to death! I'm a sump newbie, that was dumb!
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