Sick Serpae Tetra

[Juannie]

I was wanting some advice, one of my little serpae tetra's looks like it is losing weight, does anyone know what may cause this & how I can rectify it.

[gm72]

Has anything at all changed in the tank? Any other fish looking lethargic or ill? Water parameters?

[cocoa_pleco]

if hes hunched, its TB. If hes getting pale, may be Neon disease