I have a batch of 26 langshan chicks..about 7 weeks old....they started acting droopy Thursday and on Friday night I saw blood in the droppings..they are losing weight fast...i always give medicated feed but this time decided to try a new feed that was 18 percent starter (will never do that again)...i went sat morning to get 20 percent corid powder...mixed 1.5 tsp per gallon and started them on it....also got the medicated feed and started them on that....they appear to be eating still and drinking...the ones that aren't i am making them drink a few times a day...since Saturday I have lost 11 chicks...4 of them being this morning...is the corid not working for them???what else can I do? I cleaned their cages out and added on to them so they have even more room to spread out...changed all the bedding and am changing the corid every day....they seem to be acting a little better but they keep dying...help??!!