Is it your picasso which is losing its color? Mine did the same thing. But I couldn't understand why either...I give him tons of treats like seaweed selects, and bloodworms, and brine, and clams but his color only darkens and looks good when he's excited. I also use both Zoe and Selcon and still my father's picasso looks better than mine! I dunno what caused it but he is still very healthy so I wouldn't worry yet.