Here is what I try to do: I plan for either an Amazon-type tank, Southeast Asia tank, livebearer tank, African tank, Goldfish tank, etc. I do the very best that I can to match fish and plants from the same region so the water temp, pH, and everything else will be as close as I can get it. As far as aggressive with non aggressive: in my experience, aggressive tend to pick on the non aggressive. Good luck
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