John is on the money.

Do a water change, check your calcium. Check again the next day. And the next day. And the next day.

You'll see numbers like 420, 410, 400, 390, 380... Then a water change will bring it up to (depending how large a water change you do) 410-415, cycle repeats. This means you should stick to just water changes. If your numbers drop significantly then you will/ should start adding sups.

Should bear in mind that its not how many sps you have, but rather how much sps mass you've in your system. One colony of growing sps may take more calcium than a dozen frags.

Oh, and also, the numbers above are random figures drawn to show an example.

Erik is right, IMO, about the kalkwassar... But I don't believe that your there yet. And in such a small system you really have to ensure that you don't overuse the kalk.



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