I have just had this delivered just set up, The ball plug/valve dose this go as tight on as possible, have tried it this way and the water drips out and dosent go above a certain level in the red dish.,..... also have tried the ball valve loose and filled the tank and water just kept flooding out ! No instructions were given........ Advice needed...... 1 last thing,,,,,,, if i give the chickens the same amount of volumve of water what they have been drinking out of a dish, and put it into the tank, is it ok if water if left in the tank over night, then to just pour in fresh water into the tank the next day with some old water left in there? Or is it better draining the old water of and start afresh each day with new water? thanks sorry for the length of the question !