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Thanks for the advice! Guess it all comes down to softening the calcium and then scraping or wire brush. I'll get on it and submit my results. Thanks again to all of you.

Hi Everyone... I looked through the threads but found nothing so... I bought a collection of lava rock from a past aquarist and there is a white residue on them. Mostly on the sides that were in the substrate. I think she also had a bunch of coral with them in the freshwater tank. Is...