Actually, I think a lot of people use CC in their reactors. It's still basically calcium carbonate. It might have phospates in it too that will also dissolve.
But if you think about it, crushed coral is ... crushed coral...
<a href=showthread.php?s=&postid=12228648#post12228648 target=_blank>Originally posted</a> by LeviTillie I think that's just intended for substrate and I doubt it will release much if any ca.
Ive run it in my reactor for about 6 months and its worked flawlesly. You want to keep the ph in the reactor a little lower if its the bigger crushed coral. I run mine at about 6.5
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