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The thing with drains is.. they are a PITA.. My first (amaturish) ATS had false bottom, then I made ATS with 2 drains and after about a year I redesigned it back into false bottom design again. The idea of a false bottom ATS is you have a large slot opening reaching out all the way to water level and you have a longer than needed screen that touches water level. The noise becomes inaudible - and does not require any flow tuning.. Take a look - probably for your next version:
This was the original version with 2 drains:
Upside-down re-worked box with false bottom,,