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damn my first ever post here on this site and i think i'm wrong about the mercury part..... (doh!), my thermometer was basically this: http://www.petsmart.com/global/product_det...845524441811426 and they say it doesn't contain mercury. Apologises to all -- thought i'd follow up so ppl don't...

Hi sahmof2, Yep, yes those gray balls are DEFINATELY mercury :crazy: . Here in australia there still available everywhere, cheap but reliable. I use em as well but i'm not anymore after the weekend gone..... The mercury like someone else said will be in your substrate, its really heavy...