These rust brown areas look like a "K" deficiency on the Blue Spot (plant started from clone). (not the plant in picture above)

This deficiency is probably directly related to the 8.0 PH water this plant has been receiving

If you look at the chart you can see that the plant has trouble up taking Phosphorous (k) when the PH is above 7.5

Hopefully this problem can be fixed by flushing with water PHed at 6.0

love