keeping calcium
 

i'm having problems keeping my calcuim levels up in my tank,looking for advise.
i have a big toad stool that i am guessing it is absorbing most of it.i thought of trying magnesium but don't know,please help

what is your alkalinity at....if your alk is low it will pull your calcium low!!(I think)

Your toadstool is not absorbing your calcium. While they may use a very little bit it is doubtful. Calcium is abosorbed by calcifiying creatures such as Clams, Small Polyp Stoney corals(SPS), and to a somewhat lesser degree by Large Polyp Stoney corals (LPS). There are others but those are your big users of calcium. You need to have calcium, alk./hardness, and magnesium in balance. I try to maintain mine at close to natural sea water if I can so Calcium at 400ppm, alk/hardness at 8dkh, and magnesium at 1350-1400.