Fat black neon tetra

[Aks3311]

Hi there,
I have a really fat tetra, been like this for about 2 weeks now but really seems to ballooning now, also more on one side than the other. Water parameters are all good. Iv given them peas and starved the tank and still the same. Still is eating. I have a couple of photos, tried to get the best I could but he seems camera shy ?

 

[corylover5]

@Colin_T

 

[Sgooosh]

its bloated. @Colin_T might be able to help

 

[Sgooosh]

@Colin_T

haha u got it before me

 

[Aks3311]

Anyone?

 

[Guyb93]

Looks like dropsy to me

 

[Essjay]

It's not dropsy as the scales are not sticking out. But I don't know what it is, I'm afraid. It looks most like some sort of internal growth.