I was advised to get my 6 week old chicks some poly-visol without iron well I did I put 2-3 drops in their beaks yesterday now today they are acting sicker than they were they have had cocci they were treated and now do not have it . anyway dh went to feed them and one was dying it had what looked like a seizure so he culled it. I got looking on the bottle of poly vi sol and the pharamist said it did not have iron in it. well the bottle says that it has ferrous sulfate as a stabilizer THAT IS IRON !!! have I killed my chicks?