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
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150gal,27gal sump,2-150 watt mh,2-atinics,2-10000k,
8watt moon,skimmer,rena xp3,80lbs live sand,180lbs live rock,sps,ribbon eel,tomato clown,chocolate chip star,
sea hare,cowfish,birdmouthwrasse,longnosehawk 
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