So I got my Citrinus goby about 7 weeks ago. Then it's color was very dull more like brownish side rather than the bright yellow otherwise. I was hoping it's color will improve upon feeding. Well it's the same till now. I am feeding various foods including NSL flakes, mysis, hikari, seaweed etc. Sometimes soaked in selcon, even cyclopeeze. Nothing seems to help. It is otherwise healthy and active. Just dull in color 