My yellow lab is a little aggressive it has gray around its mouth and black marking on his/her left side the upper area under the fin.... Im wondering if its sick? Whoever knows about this please tell me!!!!
Now my is not sick because jd is the boss in the tank. After som duel fight yello lab goes to his hiding place and his color turns back to yello. It's the duel fight that make him change of color. It is possible when he gets sick he will have that color too.