Ok so yesterday we got a new fish for the fiancé's FOWLR. She wanted a Cortez Rainbow Wrasse. Well we already have a Blue Head Wrasse but figured why not get another. Well everyone is being just fine no chasing or biting. But her Blue Head keeps swimming right next to the Cortez and changing colors. Normally he will be Blue with 2 black stripes then his body will be a greenish/yellowish color. Well he will make himself all blue his whole body will be completely blue. Then go back to normal coloring. Is this normal? Something we should be worried about?