I have seen the poop chart but honestly some of them I think don't look right it says are ok. This seems different than what they normally have too. And it's not just the one, I saw another one with a similiar foamy yellow poop. It's foamy with little chunks. Only thing I did different yesterday was add some straw (had been on shavings) and used a bit of rooster booster in their water (which they have had before, it has probiatics in it and vitamins etc) Some of the almost 4 week old chicks look a little fluffy, maybe hunchy but I moved them from the warm bathroom to the garage so that could be why. (They still have their brooder light but not sure it does a whole lot for them) All of them are eating and drinking ok.