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I had the same issue, I removed half the live rock and let it sit in the sun for 2/3 weeks. Then I sprayed with hose to remove unwanted gha. It worked great. Muriatic acid is very strong, you don’t want to mess with it, it will eat up your live rock, and it will mess up your DT chemistry. Unless you neutralize it in freshwater with baking soda, and make sure ph is optimal before you put it back in
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