Woke up to all 10g of my top off water dumped in the sump of my Red Sea 250 Reefer , the ATO pump was still running dry when i came down. Luckily only very little water was on the cabinet floor. Its the Tunze 3152 ATO , anyone had this happened before ? Check the float switch and it was still moving freely, isnt it supposed to only run for 2 min max ???