Auratus Cichlid loosing color?

Hello all today i noticed that my auratus cichlid is looking a little pale. Not as brilliantly yellow as it was before.

I have in the tank 3 different cichlids in a 23 gallon with decorations in it for hiding along with a huge rock in the middle with cut outs for hiding on the inside.

Ok now to explain activity in the tank. When i originally got the fish i started off with a Mbuna and the Auratus. The next day i added a blue johanni. Each day i noticed that the mbuna and auratus would pick on the johanni that was up until i started putting decor in the tank. the first item in the tank was the rock. it stands tall and has a few openings in it. The mbuna took over the rock and still the auratus picked on the johanni. Then a few days later i got some taller fake plants in and put 2 in a corner where the johanni chills out and 2 on the other corner of the tank. Since i put those plants in i noticed that the johanni now gets very territorial and chases the mbuna away and the auratus. So today i looked in the tank and saw the auratus looking a little pale. So i am a little worried hoping she is not sick (Auratus yellow with black stripe i believe i read thats a female). Is she sick or is this a display of her loosing dominance in the tank.