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After about a week or so this white stuff started to appear everywhere on my setup! It’s white and powdery. It settled on all the aquarium glass the bottom, sides, sump just everywhere and was kind of tuff to remove from the submerged glass.
The truth is I haven’t tested the tap water since my 5 Stage RO should be arriving next week. I suppose I have really hard water. Any idea what it could be? If I were to guess I would say it is some kind of marble residue since there are mountains around my area that are mined for marble….