As the title says my blue hippo seems to be changing colors. Is this normal? I got this fish from another member and it is 6" long at least. It is very healthy and eats a lot. On one side of its body i noticed where the black line is in the middle it had a small yellow coloring coming in. Now today the color has spread and its about a inch across. No signs of ich or any disease just color morphing. Has anyone else had this happen? It was moved from Jeffs 100g to my 210g so it has a lot more room. Could this be the reason, a dominance thing? Tonight I added a 5" Sailfin tang. I forgot to turn on the lights before I went to the meeting so the light schedule they are used to was a little out of wack. Any ideas?

Ray