i got a Cynotilapia Afra from the local FS about 2ish months ago and fed him only frozen blood worms up until about a week ago, before he was bright colors and waiting every morning for food and eat it like he had never eaten in his life. i am now feeding pellets to get some vegetation in his diet and balance his digestion but now he never eats when i feed him, he is almost completely matte black instead of the black with electric blue stripes he was when i got him and lastly he just sits on the bottom now and doesn't do anyting. it almost seems he went from living, to surviving. what am i doing wrong and what do i do to fix it?