last Christmas I got a hydor ato. I hooked it up and put a pump with it. it was going great at first until I heard it going off in the middle of the night. it had dumped at least 2 or 3 gallons of fresh water into my tank so I stopped using it until I found a smaller pump. I finally found one that does 3 1/2 gallons an hour. I thought that would work perfectly. I was kind of wrong again. it did fine at first it filled it up to the max and stopped. it didn't mess up till the second day which is now and it had dumped half of the water from the jug I was using. I have noticed that it goes till it alarms but it keeps doing it. I need help on what I should do. anything will be grateful please help!!!