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So here's my 2 cents, for filtration, I'd use a caddy with filter floss. Amazon has a kit with regular filter floss and 100 micron floss and that should honestly cover your filtration. For flow, ya, I'd add a pump/wavemaker. I just put a Jebao Mow-3 in my IM15 and really like it, it is extremely small so it isn't an eyesore at all. Then aim your return nozzles to the surface for agitation. For an ATO, I bought an autoaqua, they're about $50, but, you've already ruled out an ato, just keep it in mind.