well my poor lil baby is still under going treatment, but shes had melafix, and shes had anti internal bacteria. she seemed 2 perk up, but the redish loking spots seem more like holes now. i dnt think she has tb, so she cud make it.
as far as i no, even if it is tb, if uve been vaxcinted against it (usually in the form of a BCG) then u sud be ok.
my advice is to do wot ive done, treat the tank with melafix, then if she still aint perked up, get a smallish hospital tank, stick the ill 1 in there, n treat the tank with anti internal bacteria. if all else fails, take the fish to the shop u brought it at, (like i plan to do) tell them what uve done 2 treat the illness. see wot they say/suggest.
as i have found, describing the spots to sum1 ova the fone/net is very difficult, and therefore taking the sick fish ova is better, as they can dingnose (i cnt spell, sorry) the illness better than ova the fone/net.
i hope it all works out, keep me updated as i wud love to hear hw things are going with him/her.