That for sure isn't a lyretail.
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Looks like bimaculatus
Yeah, so what is it?
Purple edge to the dorsal fin is quite common in these fishes. After taking a closer look, they're probably carberryi. How big are they? C stay on the small side. Relatively easy to keep.
I picked up 15 from the same source as well, they are cooperi which last I checked was a synonym with kashiwae. I can't wait till the group gets out of Q