Sure there are nice critters in the rock, but you have just as good of a chance getting bad pests.... Or man eating pods by the thousands... Plus most of the time its not that hard to grab a pod or brittle star and toss it in with the curing rock later on.
I only use tap water for my tank, guess I cant say anything against that one. But isn't there a difference between the bacteria that helps filter in FW vs what helps iN SW? Wont the bacteria that colonizes in fresh die off when its tossed in salt?
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