Unfortunatly,I know nothing about this fish but wanted to say that I am sorry for your loss.
Grice

In a captive environment the bullied fish has nowhere to run, he's constantly harassed by the larger fish. He probably starved form being outcompeted for food. His stressed condition could also lead to illness. Discus are hard to keep even under good conditions.

i agree with the above except for them being hard to keep. i 've never had an easier fish to take care of than the current crop i have now. i bought 5 from macs discus online two years ago and one died, i think the very large pleco i had sucked on him at night and killed it. i have one loner now and three that hang. the loner doesnt seem stressed out in fact for months he has been causing stress, if anything, as he attacks all the others. they are schooling fish and like an african, more fish means one is less likely to get picked on to the point of croaking off. these guys require very low ph and, like my clown loaches, the water never seems to be too low in the ph dept. my black ghost is spozed to like neutral ph but he gets along fine in the low ph. i change 12 gallons to 15 twice a week in my @50 gal tank. water changes are crucial. i feed them frozen blood worms and shrimp once a day before i go to bed and they really chow down and that seems to keep them happy. they have started eating the "sinking carnivour" tables from hakari or whoever that i try to get to the ghost. i guess, like the clown loaches, they would prefer to eat a little all thru the day but that's just too bad. i am going thru alot of $$ feeding them once a day. sorry the little guy croaked, get some more!