View Full Version : calcium supplement

09/07/2017, 02:39 PM
Can anyone recommend the best supplement for 20 gallon reef tank to help maintain good calcium levels etc for corals.

09/07/2017, 03:19 PM
Test with a Ca test kit.

If low, CaCl from Foster and Smith or BRS, or Dow Flake.

You can also maintain or even raise Ca and alk with limewater(kalkwasser for you Germans).

09/07/2017, 04:27 PM
A 2-part like B-Ionic or a DIY version is a good way to keep calcium and alkalinity in line. They are consumed in a fairly fixed ratio, so dosing them together makes sense. For calcium only, any calcium-chloride-based supplement will be fine. Kent Turbo Calcium and SeaChem Reef Advantage Calcium are reasonable commercial products, although the bulk chemicals are cheaper.