So I have a 5 gal with 6 ember tetras, the tanks been up a few months now and I've had the fish about a month, they're full size and the water conditions are perfect, no nitrites/ammonia and very little nitrates with regular water changes, the pH is a little high for their ideal but there's nothing more I can do without using chemicals, the water params are stable. It's a low tech pretty well planted tank. I noticed during a water change two days ago one of my tetras wasn't getting out of the way of the gravel vac and thought it was odd but chocked it up to high nitrates or something out of whack with the water and went on with the change. Today when I was feeding them though I noticed a small white patch in front of the dorsal fin on one of the fish, it also isn't schooling as readily as the others and seems to be less aware of it's surroundings, but still goes for food as readily as the others and with the same enthusiasm. I would quarantine but I don't have a tank set up and I have to pack the fish to take with me to college wednesday. Does this sound like a disease I can treat? Should I take extra precautions when travelling or separate the fish in the mean time? Anything I can treat my tank with now?