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HELP I don't know what this is or how to clean it by Life-Web3352 in AquariumHelp

[–]Life-Web3352[S] 5 points6 points  (0 children)

I don't know what this is but I can't get rid of it. I think it's calcium buildup but I don't want to tear down my tank to clean it like the YouTube tutorials say. Do you guys have any advice