BWBettas
Bettas Eh?
Is it possible to be something reproducing in her guts or insides? could be a parasite etc. Wilder should be along soon, she helps alot of people in trouble! 
Bret

Bret

How would I know if it was a worm of some sort? Would she not get thinner because the parasite is eating all her nutrients?
Its a common problem tho i even found another fish that has a strangley familiar growth
I'm sorry.