A tri-color halfmoon male. His body is blue, and his tail and fins are blue and white with a stripe of yellow (which can't be seen in all pictures).
I had a hell of a time trying to take pictures of this guy. I put him in a plastic storage container about half-full of water (3 gallons in a 6 gallon container) and he's all over the place. I could never seem to get a good shot of him while he was displaying fully, so he looks more like a superdelta in most of the images. He may very well be, but I'll give him the benefit of the doubt since he looks pretty young and may not yet be fully grown.