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Remove the dying fish to a quarantine tank pronto. He could easily get the other fish ill with whatever is killing him.
By the way, gourami and bettas are known for fighting with each other due to being closely related and viewing each other as competitors. I'm glad it is working for you right now, but keep an eye on that tank in case that changes
By the way, gourami and bettas are known for fighting with each other due to being closely related and viewing each other as competitors. I'm glad it is working for you right now, but keep an eye on that tank in case that changes