Here's what I'm pondering tank wise - 18x18x36" (maybe 48") test section, not sure on flow rate, need to come up with some target numbers for flow - that dictates a fair bit of the plumbing and design, in run and outflow - kinda like to be able to keep it on a 24x72" workbench, but we know how that works...
luckily the aquariums have me in ownership of some big pumps, got a few to choose from, up to a 6000gph monster, but they're not so speed adjustable, so guess a NEMA 17 steppers going to have to get adapted to a knife valve for flow rate control...
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