I've seen sumps consisting of rubbermaid tubs before, I doubt you'd have a problem with it. If you want to incorporate a fuge component, maybe try just building a box or partition out of egg crate and sticking a ball of chaeto in it and hanging a light over it. That way you'd have some separation to prevent it from drifting into your skimmer pump or return pump. Just make sure it's big enough to leave the cheato move a bit.
Another method that I remember seeing somewhere online when setting up my tank years ago was to plumb two totes together using bulkheads and pvc pipe. The overflow feeds the first tote which is the fuge, water then flows to the second tote which has the skimmer, heater, return pump and anything else you want in there.
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