Hello everyone! I think I may have a case of fin rot in my tank. I noticed yesterday that one of the black ruby barbs's tail fin had a blackish edge to it. It almost looks like it had been burned and is starting to fray. I did a little research and it sounded like fin rot. The research said it was often accompanied by white dots, and when I looked at the troops again one of the other barbs seems to have white dots on his tail. I got really confused with my research, since it seemed like there were two versions of fin rot, bacterial and fungal. Since these two fish seem to have different symptoms, do they have different fin rot? I am obviously looking for an answer to how to treat it. The only issue is I do not have a quarantine tank, since three days ago I had to utilize my backup tank for another fish and it's no longer available. In addition, I'm leaving for my parents tomorrow for Christmas. I'll be gone nine days. My boyfriend will be able to stop by once during that time period to check up on our tanks, but that's it. I'm a little concerned with how I'm going to treat my fish. My parameters are: 78F, 7.6pH, .10 (estimate) ammonia, .00 nitrite, .05 nitrate as of right now. Haven't done their regular water change yet today. Also, could this have been a result of my heater breaking? It stopped working but I didn't notice right away because I was in the process of setting up in a new house, so the tank water was probably at 66-68F for a day or two. Thanks so much everyone!