My 7 week old banty chick just threw up some purplish-pinkish liquid and a small purple blob. The chicks were just moved to a new location but should not have had access to anything chicks shouldn't eat. My boyfriend gave them a tomato and they have a seed mix that's mixed with their chick starter. He doesn't seem to be drinking an excessive amount of water, they were moved to a different house and have been separated from me, who's been their primary caregiver and the person they've most socialized with. They seem upset and confused about the change, but I don't think they should have health problems from that.