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Mine used to swing 10 pts a day cal, alk pretty stable due to dosing buffer via topoff, and I still had good growth, good PE, not so great color. Well, rotten color. Ushio bulb, which is another issue.
Now with a kalk reactor, I'm staying right at 9.3 alk and 420 cal for weeks on end. I can say this supplementation works with a 54 g tank with small coral 'draw' on calcium. It remains to be seen how it holds up in conditions of more demand---also I don't know what the cutoff is between what kalk can do vs when you start needing a calcium reactor.
The swing didn't seem to hurt too much, however, just with acropora aculeus and particularly montipora species, and ac. valida. The bali slimer seemed to be a little less happy with it.
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Sk8r
"Make haste slowly." ---Augustus.
"If anything CAN go wrong, it will, and at the worst possible moment."---St. Murphy.
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