2.5" rhoms having a blue iridecent color/shine to them...?
Aquascape sells blue diamond rhoms from like 2-3" up to like 8-10". (I personally dont trust the bdr's at that size unless you can see it for yourself.) Most guys say the blue is more dependent on the ambient lighting than the fish, but Ive seen bubba outta water, in water, with leds, with t8 single and double bulb of various kelvins, and a triple bulb t5ho. He's always had a distinct blue/purple to him. Hopefully yours is the same and keeps it as he grows man. Blue is definitely an awesome trait imho.
better have some good pics ASAP!