I have had an Orchid Dottyback for several months. It was shy for the first week or so but since then has been swimming out in the open even when I come close to the tank. Last Thursday I added a yellow Tang to the tank. I haven't seen the Orchid Dottyback since ( I did see him the day before though and he appeared normal and was eating fine). I checked the floor just to make sure it didn't jump out (there is a screen cover over the tank) and didn't see it on the floor. Is it likely the Orchid Dottyback is just hiding and will come back out? I have a Red Sea Reefer 425XL with 2 clown fish, diamond goby, yellow clown goby, blueside fairy wrasse, and a coral beauty angelfish. The yellow Tang is the only thing I have added in months. Thanks for any help.