Calcium question

[jpontier212]

I was testing the water parameters today and found my Calcium to be low but my ph and alk are both good. What can i do to get my Cal back up? Any DIY ideas? I heard finely crushed eggshells could work?
Parameters
Salinity 1.025
Ammonia 0
Nitrites 0
Nitrate 3ppm
Phosphate 0.1
Cal 300
Alk 11 dkh
Temp 79.3°F
Ph 8.1
Livestock
1 yellow tang
1 tomini tang
1 royal gramma
1 lawnmower blenny
1 maroon clownfish

Corals
2 zoantids
1 green frog's spawn
1 polyp zoa of some sort

 

[theatrus]

A solution of calcium chloride in water is the sure fire method for raising calcium alone. You can find reasonable dry quantities from a bunch of vendors, including BRS.

Ca imbalances can also be caused by low magnesium - I'd get that tested before trying to raise Ca as it may be impossible with low Mg. Mg can be raised with magnesium sulfate (Epsom salt) and magnesium chloride.