nice Festaes, keep us posted on how the pairing process goes. Once I tried to pair up some adult red devils...after a week the female got severely owned.
I think some of that color has something to do with the black gravel. but not sure. these two colored up alot better in black sand than the pair i used to have. They are too cool, as soon as i open the door they both change color immediately... it pretty cool to watch.