On Tuesday I got 3 lyretail anthias from Diver's Den. They are very active, eat like pigs and seem very healthy. However, one of the females has fungus on her tail fin. I contacted LA and they said that can happen from shipping, since the water in the bag gets so gross, etc. My question is, what should I do about it? Is it contagious, or just opportunistic? I really need some guidance! Thank you!!