Possible TB - Zebra Danios

[W_Oz]

So, before we get all uppity and tear down a tank to sterilize it and kill the bulk of the inhabitants to keep this bug down. We'd like a few opinions from the Aquarist population at large. We only have what we've read on the web about this soooooooooooooooo. Yeah. Is this TB or some other bug/situation we're dealing with?

Symptoms -
Fish seemingly randomly becoming emaciated (see second attachment) and eventually becoming listless, having difficulty maintaining their attitude, and a general loss of appetite, this has happened to two fish in the last 3 to 4 weeks (the third is the one in the photo). There are two long finned variants which have a unique body shape, though as far as either of us can recall they've always looked like this. (See first attachment) This is also only happening to the Danios at this point, none of the other fish in the tank have been symptomatic. None of the deceased fish exhibited any notable deformations.

Tank Vital Stats -

Capacity: 55 USGal
Water Temp: 76-80°F
NH4+/NH3 : 0ppm
NO2- : 0ppm
NO3- : 15ppm
pH : 7.3

Tank Inhabitants -

Burmese Boarder Botia - x5
Zebra/Leopard Danio - x9
Siamese Algae Eater - x2

and a smattering of Rams Horn and Trumpet snails along with a host of Ghost Shrimp.

Latest Fishy additions -
Burmese Boarder Botia (x2) approx 3-4 months ago.
Leopard/Zebra Danio (x12) Mid January 2009.
Burmese Boarder Botia (x3) Early January 2009.

Latest Non-Fishy additions -
Trumpet Snails from another aquarium in the house (sans fish since it was put-up) 2 weeks ago.
Ghost Shrimp (x20) 2 weeks ago. (Local breeder)

The tank sees regular weekly to bi-weekly water changes and is planted.

So that's what I know. Any thoughts?

[Wild Turkey]

Dont freak! Its most likely not TB.
These types of deformities are a common cause of inbreeding. The two most common are spine deformity and mouth deformity, and said to say zebra danios are one of the most likely to exhibit these signs since they are quite an actively breed fish and popular in the hobby.

You can cull them if you like, or you can let them live out their days. If you got them all from the same place its likely that the others will develop deformities later on as well. If they have babies though, the babies will be this way most likely, so no breeding setups for these guys.

I feel i must warn you though, if you let them live out their days you may end up just culling them off one by one as they get too bad to function well.

Heres a video I shot of some a while ago
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Only a few of these had the deformities at this point, and they were slight. However since then they have all developed them and eventually swimming problems except 1.

[Wild Turkey]

Accidental double. Mods? :D

[W_Oz]

Cool, thanks Wild.