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nycjwi
09/07/2017, 03:39 PM
Can anyone recommend the best supplement for 20 gallon reef tank to help maintain good calcium levels etc for corals.
thx

nereefpat
09/07/2017, 04:19 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).

bertoni
09/07/2017, 05:27 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.