what you treating them with mate? i would put them on nyfuramycin for 3 days as it looks like you have got a secondry infection, i would then follow up with nystatin for a further 3 days, if the birds are not drinking, syringe 10mls down there throat twice a day (nyfura) then 2 droplets of nystan 4 times a day,j.m.o, hope you get them sorted.