Is there anything wrong with my spotted raphael catfish?

[eurospage]

hey yall, i bought two spotted raphael fish last week. They seemed to settle in well found caves and seemed to be happy. Last night i seen them both out just swimming slowly but one of them has seemed to lost his colour on their belly. It was just like a grey white colour. I did turn the room light on first so can they lose colour to blend in with the sand or is he ill? I cant really take a picture because he just hide's all the time. He is in there with two striped raphael catfish and 1 clown plec and 1 common plec and a few guppy's and neon's. The tank holds 155 uk litre's. Cheers for your help. cheers

[Marc van Arc]

Don't worry. Most fishes become a lot paler during the night. Ever seen a Neon tetra when the lights are turned on in the morning?