I bought a diadema pseudochromis. It had the run of the 90gal tank and happy. Then, I made the mistake of introducing a very similar-looking purple basslet. The diadema now hides continually and it can't come out from behind my powerhead without getting it's tail nearly nipped off. Do I have any hope? And will this basslet do it to any others I introduce (it seems to leave the pajamas, green chromis, shrimp goby and jawfish alone.