Suspected Fish Tb- Help!

[JenLo]

I posted about a month ago after a platy suddenly got ill. It's back was bent and after a few days it died.

Well I hadn't noticed any other problems - until now. One of my guppies I noticed has suddenly lost a large part of its tail. I've changed the water and treated the tank with melafix. But tonight I've noticed the guppy now too has the bent back. I've attached a pic.

Is this Fish TB or something less sinister? Should I continue the meta fix treatment? No other fish showing symptoms.

I tested the water:
Ammonia 0ppm
Nitrite 0ppm
Nitrate 0-5.0ppm
PH- 7.8

I turned the heat up to 26 degrees c recently after my neon cardinals had white spot, it seems to have solved the problem.

Any ideas??

I should add- other tank mates are:
X3 guppies
X6 danio
X4 cardinal tetra
1 platy
1 plec

They are in a 100litre tank. Thanks.

 

[AshleyNZ]

Ive just looked on http/www.aquaticcommunity.com/disease/tbc.php, and I quote from their site:
(For treatment of TB)
Treating fish tuberculosis is really difficult and euthanizing the fish a probably less painful for the fish than forcing it to go through endless treatments that may not have any effect on the disease. Euthanizing all the fish in the infected aquarium is also the best way of preventing the disease from spreading.
If you decide to try and treat your fish, keep in mind that Mycobacterium marinum can infect you as well. The risk of being infected can however be decreased dramatically by following a few simple safety guidelines. You can read more about this further down in this article.
Fish can be treated with the same drugs as humans get when they become infected by Mycobacterium marinum, e.g. Kanamycin. Since this is a very resilient microbe, normal treatment involves administering at least two different medications over the course of at least three months.
A lot of aquarium problems can be fixed by performing frequent water changes, increasing the water temperature and adding some salt to the water, but fish tuberculosis is not one of them. Raising the water temperature may even worsen the problem since Mycobacterium marinum prefers warm water (their ideal temperature is 30°C).
I hope this helps you, and good luck with him. 
-Ashley

 

[star4]

I didnt see you post about your other fish. With TB the spine bending is a latter part of the disease and spines will usually bend in and s shape as you look at the fish from above, you would also see leisions on the fish, like burns or bite marks on the body of the fish rather than the fins that will not heal with clean water or treatments like melafix, bacterial infections and fungal infections become rife as the fish's immune system is depleted. Fish TB is quite rare.
 
WIth you already loosing a sick fish, a cardinal with ich (I take that to be the only one) now your guppy, my suspicion would be an internal parasite - worms, the worst being camalanus worms. I had an outbreak last year in a tank with small fish, I had some go skinny, some bloat and a couple with spines starting to bend, it was only by chance I saw one of the rummy nose tetra with the red worms hanging out of the anus. These worms are not always visible until the fish is so over loaded with them or they hang out of the fish to drop eggs when the fish is resting, as soon as the fish moves they can just disappear back in again.Try watching the fish for a while see if you can spot anything poking out of the fish, they are small and can be difficult to see. 
 
The best medication would be sera nematol,its a fast acting one dose (although you can do it twice) treatment.