Hi. New to the site. New to the hobby. Got a purple firefish, only fish in the tank. It's been a couple of days, and I think I saw it once the whole time. There was another purple firefish tank mate at the shop, and they seemed to be cooexosting well together. Think getting the former tank mate firefish from the shop would make mine feel more comfortable at home, or just give him time? How long before I should worry, and move rock to go hunting for him? Have a Biocibe 29. Lots of places to hide in the rock. Thanks in advance.