I have a pinstripe that I got from a breeder who kept her in a tub. I put her in a 20gal tank and she did not eat for 7 months. To my surprise she only lost about 10g total in those months. I tried every week for 5 months, then I literally stopped. Everything. I stopped going in her tank (only to change water) I stopped trying to feed. I painted three sides with black paint, and covered the unpainted side (front) with a towel and left her alone for 2 months. Until one day I decided to try again and she finally ate for me. She's been eating every week since August, sometimes 2 in one feeding.
I guess what I'm trying to say is keep trying once a week for a while. Keep the Viv dark and leave it alone. If still nothing, then I would stop trying to feed for a month or two.
I've heard of a ball going over a year without eating.
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