Hi, tytanic11. If your Gourami is killing fish, you may have an exceptionally aggressive Gourami. Exactly what type do you have? In that size tank, I would say a dwarf would be a decent choice as they stay smaller and are fairly mellow by Gourami standards. If you have anything else, it is probably going to be too aggressive for such a small (relatively speaking) aquarium and will likely end up the only fish in the tank.
As far as the black skirts, I've never had anything but trouble with those. If you're sensitive to fighting in your tank, which a lot of people are, you have chosen some rather aggressive and nippy fish and may want to re-think your stocking choices. I'd be happy to help you with some other options if you woud like to explore that possibility.
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