My chickens are only 8 weeks old and have a PVC nipple waterer in their run. We just added sand to the run floor and now the waterer is too low to the ground for them to use. I would like to raise it up to the hight they will need when they are full grown, I figure they can just use their chick waterer until they grow into it. How high off the ground should it be? I have barred rocks and jersey giants. I'm sure it should be best to wait till they are full grown but I'm being impatient and would like to move it now! Thanks!