Alk = 4 meq/l
Calcium = 425 ppm
Mg = 1300
pH = 8.25 (am), 8.45 (pm)
Temp = 78-81
ORP = 380
Salinity = 1.025
Ammonia=Nitrate-Nitrite=Phosphate = 0
I use a weak kalk water solution for all water topoff
I wouldn't worry too much about your calcium levels being high. But, with calcium that high, you should get your alk up to 4.0 meq/l. A low alk will make your pH less stable, along with increasing your changes for having calcium & magnessium precipitate out of solution.
Read this article about proper alk & calcium levels and the best way to get them back into balance.
Chemistry and the Aquarium