As most of you know I've upgraded my flourescents to a 400W metal halide and it's been running on my lowland tank for about a week now and suddenly my N. eustachya has developed white spots on most all of the old leaves (I just noticed this today as I watered the plants on sunday and did not see this).
At first I was alarmed but I see none of the spots come off when I rub them, and they do not move and has not moved to other plants in the chamber. So I'm starting to wonder if this is simply a new type of waxy exudate that the N. eustachya already released when it was growing under bright florescents.
Are any of you growing N. eustacya under MH? If so do your older leaves have white waxy spots or an even "milky" waxy coating (looks like the leaves had been dipped in milk)?
Thanks for any thoughts!