Not to my knowledge do they change colors. I had 2 have them that died about a week to 2 weeks after they were changing to a pail color. Didnt want to worry you, but what does he look like like. Was he thick when you bought him and now hes skinny?
He is a little skinny but i'm in the process of fattening him up and I am quite optimistic. I feed him frozen brine shrimp 2 to 3 times a day and he is eating quite well so i don't think that he will starve.... though it did take me some time before i came about this routine.
The changing color thing seems to be a defence mechanism as it only happens when I feed him and my hand is in the tank. Yesterday i noticed he turned pale during his feeding as well as this morning (this morning it was dramatic and scared me a little) but latter in the day he looked great!
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