sounds like dropsy to me. have you had a look at the disease charts on this board. if its dropsy i think you have to starve them, then give them peas. i'll just go have a look!
EDIT:
http://www.klsnet.com/files/fishchart.htm is the disease chart thats on this board and
Swelling of abdomen, raised scales around swollen area.
Dropsy (Malawi Bloat) – may be caused by internal bacterial infection (if swelling is sudden), parasites, or cancer (if swelling is gradual).
Add 1/8 teaspoon of Epsom salt for every 5 gallons of water and monitor for two weeks. Check for signs of bacterial infection or parasites for further treatment.
is the info about it.
good luck, and sorry i'm not much help. not something i've had to deal with before. hopefully someone with more experience will be more help. good luck and keep us posted.
tan
