hey sharn & bk, thanks for your replies.
ok heres the answers 2 your questions:
didnt see any white stringy poos and i usually use rainwater for water changes not straight tap water if i have to use tap water i use stress coat. however i havent used tap water in the last 2-3 weeks anyway.
dont feed any beef heart, just tropical flakes, color bits & tubifex occasaionallythe other 3 discus seem fine, bright colours, eating heaps.
cockatoo still alive but lookin sad is still in the same place as when i left 4 work. :-?