Thanks for this help! Phoebes and I were really bummed but maybe there is hope.

I posted a clip of the tank this morning and it shows what I think is thin-ness. Does this look like starvation or age? They are fed at least 3 times per day but its hard to track how much they each eat. The food is freeze-dried bloodworms supplemented with flakes (they don't eat nearly as much of the flakes).
We could really use some advice about their health. Thinking they were already a little thin before the ghost shiners were added last week. The shiners are pirahna-like when they feed, creating a near-frenzy. Their bellies are always bulging!
http://youtu.be/1SJY...ez5R_grVf0gr7hAThanks again. How great to have people to ask about this!