I had a male betta in my tank for a long time with no problems until I bought a female gourami?

Fish typically know the difference between species. Guoramis are typically peaceful fish, but they are prone to killing smaller fish and long-tailed fish. Aggression is also a concern when the tank is overcrowded.

The bubble nest is just a sign of happiness, not necessarily of breeding.

I read just now that bettas are a type of gourami. I'm sure the betta reacted to the female gourami being added. It happened instantly.

I removed her and the tank returned to a state of peace.

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