Been to the vets an they gave me Metronidazole in tablet form, so iv crushed them up an mixed with water as they are quite large tablets, taken me nearly an hour i just hope they havent got too stresssed with it. What i did notice though was that most of them sounded a raspy in they breathing, i dont know if thats cos id cought them an they were stressed. Ill check on them later, but hopefully these tablets will save anymore from dieing. I forgot to mention that they are 8 weeks old. They are in a stable at the moment, now then the stable is half full with this years hay now could the hay cause any problems. They are bedded on straw, i didnt realise that i kneeded to wash my foot wear before entering them if id be walking on the area with my chickens, i was told this is how blackhead could have been transmitted, if it is that. The vet said the only way to tell would to be do an autopsy. Just got to see what happens.