I think this white material is CaCO3. its forming big chunks as well as a white dust (more visible in the blue light). The tank is 3 months old and ive noticed this happening for about 1 week. Started with dry rock). Ca 400 (down from 420 last week). KH constant at 143. pH 8.1 . (I need to pick up a Mg test kit, but I have no reason to suspect Mg should be low).
Any ideas why this is happening, and what should I do about it? Thanks in advance.
Any ideas why this is happening, and what should I do about it? Thanks in advance.