i recently got 2 chicks. one was 4 weeks old, the other is 8 weeks old. my four week old recently died, the vet told me that she most likely had mareks disease. any info on mareks you could give me would be great! ok so the 8 week old chick is fine, shes healthy, eating well etc.. one thing ive notices is her poop is really runny, almost clear like water! and looks as though the pellets arent dissolved properly. any idea what this could be? now.. i bought another chick today as i didnt want my 8 week old to be lonely, the new chick is 6 weeks old and is really alert, pooping fine, eating well etc.. my older chick however keeps pecking at the new chicks head.. any ideas why? erm.. so yeah, sorry for the confusing essay! please help me any way you can!