03-26-2011, 07:54 PM
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Having calcareous rocks would make things worse. The water is already very hard from your numbers. As I said, I've never seen this, but then I have very soft water, and always have, which is why I think it is likely related to the hardness. Having it on everything and not just the plants would support the hard water/mineral cause. Usually it is something one sees as water evaporates, leaving behind the mineral deposits; having it occur in the tank like this is different.
I am certain that I have read something about mineral deposits in relation to planted aquaria, but going through my reference works just now I cannot find it. When you want something...
There are many members here with similar hard water, so if any of them see this thread they may be able to confirm, or alternatively tell us what it is if something else.