Welcome to reefs.org, vito! Please take a moment to check out the following URL in order to help you get the most out of our website: http://www.reefs.org/library/howto.html .
To answer your question: the easiest thing to do would be to do a good sized water change around 20% or so. That should get both your calcium and alkalinity back in line at the same time.
I taught calcium precipitate out of solution at around 550 don’t quote me. Is your tank snowing? I would look at your test kit, what kind are you using. How old is it. Changing 20% of your water is an excellent idea.
Afh your totally well nearly right. :lol: it precipitates between about 520 and 550. christmas again m8 :lol: where's that shovel....snow looks good on a chrissy card tho
Hey Garry we had about 26 inch of snow Here in Massachusetts yesterday. It has been a long cold winter here in the states. So you have never seen a reef tank snow. I participated in a water analysis by Dr Ron and found that the test kit I was using was about 100 –120 point off. Needless to say I replace the test kit.