My chicks are about 1 week and thriving so far... I haven't found anything concerning until today...I noticed a small pile of liquid poo, smaller than a dime and dark brown. Some of the other chicks are having mildly foamy poo and others are well formed. Does this sound normal or like something to be concerned about? They're eating chick food (20% protein). The heat is set at 99.5 and they have access to a 32 oz. rabbit waterer that they are using with ease. They all seem healthy and active. My other question is about treats...Is there anything I can give them such as bananas, apples, or other fruits and vegetables that wouldn't compromise their nutrition?