Could be a while until he comes out & eats. When I introduced my first Maroon, it didn't eat for a week, and that's without having a Wrasse to deal with. The Maroon & a Blue Devil Damsel were the first two additions to my system. Both juvis & they stayed out of each other's hair. I was concerned since the Clown would do laps back & forth along the glass all day, no idea where he got the energy without eating. Then, just like that, after about a week he started chowing down. He is now the 'she' of a breeding pair in my system and although she's likely one of the more docile Maroons on record, she will defend her territory & mate if threatened. I can actually get in there with my hand without her getting too upset as long as I don't get too close to the pair's BTA. If I stick a toothbrush in there to scrub some algae, she goes ballistic.