Weird Film on tank

[marie]

Originally Posted by 'Ol Nobodaddy

Well this is a first, i have a white film on the tank that i need to scrape of with a razor...some came of in what i would describe looking like melted teflon tape. Most comes off in a whitish "dust cloud" water is very murky...you can see the particulates..looks like fine sand blowing around. I'm thinking either its the water...RO Broke...replacing as soon as i can. Or its the damn playsand in the refugium...either way i have never seen this before. Going to test water again in a minute. But since i had to do my top-ups with tap water for a week or so the damn prime/amquel messes up my readings on ammonia. Seems i'm going to have to buy a hang on to polish the water a bit...or a diatom filter...wish i could find one again.

sounds like calcium precipitate, could your tap water be hard and adding it's own cal/alk to the water?