Yes the wound is very red inside - 2nd photos but it doesn't appear to be the same wound as in the 1 photos.
It's important to take Axy out of the tank & treat wounds such as these as soon as possible. He/she may have been hurt due to the sharp edges - pots?
I thought a salt bath may be too strong in salt content for the wound, Cynthia, which is why I wrote salt solution treatment instead... basically to help prevent infection setting in.