Is there any treatment for Fish TB?

Unfortunately I believe I have an ongoing outbreak of TB in my tank.
Over the last few months I have lost 2 Danios and today have
quarantined another with the same symptoms. It has a sunken belly and
it has the same spine twist I noticed on the others. It is eating
sporadically but otherwise looks like it is having trouble swimming,
fins are all frayed, etc. I euthanized the other two but had not
diagnosed TB until the last one. I have read that Kanacyn is the only
medication which *may* work. Should I attempt it? With the others,
once the belly sunk in and the spine twisted they went downhill fast
and it wasn't long until they would not eat and looked very ill. I
don't want to just euthanize this one right away but with the track
record I have here, do not want to prolong it's suffering either. More
disturbing is, in the attempt to net this one took a good long look at
the remaining two and it seems as if their bellies are looking
somewhat sunken in. The only other fish inhabitant is a female Betta
which looks fine.

Anyone had any positive experience treating TB? For the people here
who have more experience than me, what would you do? As always, any
input, advise or guidance is greatly appreciated. These were my first
community fish and I feel terrible for them and quite helpless to help
them.