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I believe this is a color morph of Colisa lalia if you want to look that up.
Great fish that is good in small aquaria, but they are usually profiled as being peaceful, which I have not found to be the case. Use caution when stocking them, but they are one of the most colorful FW tropicals. The can handle a broad range of pH and other water values. They are allegedly easier to breed than bettas, but similar bubble nest building habits. There is a quick profile of them in the November TFH.