Yikes, that's a bummer. Yeah I have 5 discus in a 30 gallon. 50% WCs every other day. Diet of blackworms and frozen blood worms. I need to get rid of 2 or 3, but I like them so much. They're getting territorial now, too. I think at the next Silicon Valley Aquarium Society meet (every 1st sat. of the month @ Round Table Pizza on Moorpark, in San Jose - shameless plug), I'll donate my 2 pidgeon bloods for the auction.
As for price, I have no idea. $20.00? Probably 40 in an LFS.
A 55 gal. is pushing it size wise in my little condo. Maybe later this year, I'll sneak one in. I might have to up the water changes to like 70%+ every other day.
Thanks for the replies