So it's been two weeks since I brought home my Dario Dario and up until today everything has been going great. The first two days I tried different flake foods and frozen Blood Worms and Brine Shrimp but they weren't too interested so I now have them on Miro-Worms and they have been eating great and looking healthy. I also have kept up with my weekly 50% water change. However, today I noticed a black spot one of their tails, the fish is acting fine but i'm not sure if it's a healing wound or a sign of something else?
So I'm looking for suggestions here. I could add a little salt to the water but first thought i'd look for some feedback first.
Here is a picture (the best I could get) of the spot...