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Are these pumps older? Made before about Aug 2010? In August of 2010 we changed a few parts to reduce the click, older pumps would click. It is a fairly simple and inexpensive upgrade. The date of purchase would be the biggest help as if they are older than Feb 2008, another part may be needed as well.
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Roger Vitko
Tunze USA
"He's for every one of us, stands for every one of us, he'll save every man, woman and child in a mighty Flash!"
Current Tank Info: 210 gallon planted tank with Altum Angelfish
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