I bought a female betta the other day. She looked rather slow and legthargic when I got her but I figured she just didn't like the pet store. Since then she hasn't ate at all, or atleast nothing I could tell. Well I just noticed shes now swimming sideways and her left eye has like this weird egg white bubble growing out of it.. its so sudden, she was fine this mourning. Any ideas what this is and how to treat it?