I started to use a CO2 Scrubber plugged to Tunze Comline DOC Protein Skimmer 9001 in a Biocube 32 gallons. It was working perfect. I reached the perfect PH but, a month later the ends of the skimmer got cloth, that stopped the skimmer. I removed the tubbing and found out that it was cloth like calcified. Did somebody have this issue before?