I really like coraline, it's more attractive than just grey/brown rock IMO. Yes it eats your alk and cal but I keep an eye on those anyway.
You definitely want to check your calcium and alkalinity levels regularly if you plan to dose any supplements. Also high phosphate levels will inhibit coraline growth so check those #'s out too.
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I have to go out and buy more snails for my hermit crabs.
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