I had lots of trouble with my CSS being "twitchy". I have mine as a HOB but it did the same thing as yours one day and overflowed and almost set my house on fire when it shorted the surge protector mounted to the back of my tank stand. http://www.aquariacentral.com/forums/showthread.php?t=144590
Since then I have it set up to drain into a 5-gallon bucket, but it for some reason seems to be very stable now. For a long time though the level seemed to change for no reason.
Robbie
Since then I have it set up to drain into a 5-gallon bucket, but it for some reason seems to be very stable now. For a long time though the level seemed to change for no reason.
Robbie