smellsfishy was right, i was tinkering with the tank as usual and by fluke the noise happened when i was right there and it was daytime, it is a vortex created by the vortech pump. thanks for all your guys input and thanks to smellsfishy, you just won a new car. not quite, but you get the point, thanks. i think i finally stopped the last 2 tiny leaks i had, they were on the intake and output of the dart pump where the fittings screw in. i've fought with these for 2 weeks now. today i just pulled the pump right out, snugged the fittings more, cleaned all the silicone off and jammed marine epoxy deep in the gap and threads, so far no leaks.
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