It sounds like it is pretty badly cemented up. I would let it soak for a day or two and the try pulling with a twisting motion. If that doesn't work I would send it in.
__________________
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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