Hello everyone...I've had my tank for almost three years now. I t houses a few soft corals, mushrooms really and a midas blenny. I recently added 5 false percula clowns. Problem is after they have acclimated to the tank, they seldom swim apart and last night and this morning they have been swimming nonstop at the corner of the tank. I am afraid they may get exausted and catch ich...or stress themselves until they get sick...any ideas or is this common to perculas clowns when first placed in tank?