if he's not attach to a rock somewhere, move him closer to the light on top of a rock. give him a few days to find his spot. if he doesn't look pale, then i think he should be fine. Just monitor him during that time period.
good luck. i'm currently monitoring one of my clown as he has gotten sick. I learn recently to get selcon and soak food in it for added vitiams for the fish. I'm doing the same for my RBTA