Drain pipes for stacked water tanks
I’ve been meaning to redo the plumbing on some aquarium racks and wanted to get advice/opinions on plumbing options from people with plumbing experience.
I currently have a return pump in the bottom sump that feeds the top tank and then each tank drains into the next tank beneath it in a loop, but it is extremely noisy and creates a storm of microbubbles in the lower tanks.
My question is about making an economical and efficient drain that would eliminate the microbubbles and hopefully some of the noise.
I could just run a standard durso drainpipe from each tank down to the sump, but I’m wondering if I could tie them all into a single drain “stack” without problems, and without the need for 3 separate drainpipes?
exaple of one idea I was toying with today: 
Here’s an examIt would basically be 1″ bulkhead drains feeding into a 1 1/2″ durso pipe (ventstack). Would that work? Would this cause a backup problem anywhere below the top drain? How do they plumb the drains for apartment buildings with multiple floors without the water backing up into the apartments below? Am I missing an easier/better solution? Any suggestions or advice would be appreciated before I spend any time ripping them all apart and rebuilding.
Thanks in advance for any help.
It could back up into lower tanks if it clogs but you are screening outlets and it it is unlikely to clog like a building grain.