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Male Gouramis build bubble nests whether or not there is a female around. Don't worry about your fish. It's a good thing. A bubble nest means that your Gourami is happy and healthy in your tank. As for the aggression, male dwarf Gouramis can be territorial. Especially while building and guarding a bubble nest. He will probably chase off all other fish from the nest, but male Gouramis are generally most aggressive to other male Gouramis. I don't know how to calm aggression, but I'm sure someone on this forum will reply with advice.

PS, if the bubble nest bothers you, just scoop it out with your net or gravel vac. Problem solved! at least, until he builds a new one. ;-)
 
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