So this morning my gf told me that one of my bosemani rainbow fish we just got this past weekend was almost black with vertical bars down its side and wouldn't eat. I understand this this is probably because he is agitated but could it be from illness? I have been lucky and haven't lost a fish yet in my new aquarium and don't want to start with the most expensive one.
The other thing is this guy is only with 1 other rainbow. I know you are supposed to put them in a school but these two guys are the biggest fish in the tank and I figured they may feel less threatened and in need of schooling then say my neons. The smaller of the two is showing great color and doesn't seem to be agitated at all. So am I looking at an illness here or do I need to drop some money on a few more tank mates for them?