Neon Green Rasbora - ?ulcer

I think I'm going to lose my last-surviving neon green rasbora. 

These fish really didn't fare well at all, all but one dying within ~a year from inexplicable causes and fatal leaps. This one is almost two, so has actually survived a year longer than the other one that had survived a year, but has had a bent spine / caudal peduncle / tail - fine when viewing her LHS, but particularly noticeable when viewed from above, and her RHS always looks as though the internal organs are protruding slightly with a black shadow over them because of the distorted spine. Fish TB was a possibility discussed with a well-known expert connected with PFK mag but that can't be definitively proven, and I wouldn't rule out this being 'environmentally' caused due to her love of swimming tilted at a certain angle in the filter outflow at the opposite end of the tank from the filter.

She's still as active as ever, zipping around at top speed at all times, but I noticed she wasn't actually eating her favourite food (Bug Bites) or other foods since the end of last week which is most unusual for her. A couple of days ago, I noticed that the dark shadow over her right flank had a 'hole' in it (similar to one of the two female x-rays - RIP) that might have been an injury but more likely the internal organs breaking through the 'skin'. Last night and this morning, it's extended and a lot worse; she's also started breathing very fast, albeit zipping around as much as usual.

I don't know whether it's worth treating with eSHa 2000 or something else but it's difficult to know when I can't definitively diagnose the cause... 

Edited to add: https:///youtu.be/9XlZEVmMZg4 plus very zoomed-in but unclear photo from yesterday illustrating the shadow (ulcer not clear as fish was too fast).

Very disappointingly, Wee Greenie didn't make it through the night. During the evening and right up until (and likely beyond) lights off, she was zipping around the hospital tank in usual fashion and I became increasingly confident that she was sufficiently robust to respond to medication, even if no improvement occurred or the ulcer would be a waxing/waning condition. During the night, I wasn't concerned about her welfare and didn't attempt any vigils to check up on her, but instead planned to get her some friends post-medication if the LFS on the far side of the city had stocked them, as I wondered if the trigger factor in her demise was the increase in shoalmates for everyone else.

This morning, she was nowhere to be found - not among the silk plants, wedged behind the filter or heater, or under the ornament. Instead, she was floating inside/at the ceiling of the ornament. I can only assume her 'top-speed battery' finally gave up during the night and the current pushed her body into the ornament.    The neon green rasboras hadn't fared well at all, which was why I was reluctant to get more, although I might have been tempted if a LFS nearby had stocked them. I now feel as though I let her down badly by keeping her on her own for the past year after the others had died (although I didn't expect her to live that long given her twisted caudal peduncle / spine) -


More reflections to follow...

I'm sorry to hear about Wee Greenie. You did what you could for her.

They are lovely little fish. I've seen them referred to as highlighter fish as they look like a stripe from a green highlighter pen.

I has some a few years ago but lost them in the whitespot episode