This is not encouraging. Fortunately the sub-male I received on Tuesday is looking good so far. A slightly torn ventral fin is about all I notice. The McCosker's is doing a lot more flashing (of course) but not being terribly over aggressive. Seems to be eating well. Bear in mind that the Red Sea is one of the saltiest bodies of water in the world, somewhere in the 36-40 ppt range, so higher salinity will likely help. Temperatures tend to run a bit higher as well due to the proximity to desert climates, shallowness of the sea, and lack of rainfall.
Dave