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I can't speak for spawning gourami's as I've never kept them but as for as angels and rams you can keep spawning pairs in community tanks. I've done if for years. Right now I have 6 pairs of angels and 2 pairs of rams in my 220g. While pairs get aggressive it stems in the area of spawning. They will charge and run off any fish that gets close to their eggs or fry. It's not like they chase other fish down and kill them. As soon as the offending fish fish swim away the parent immediately returns to the egg/fry.