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Mineral deficiency?

Recently, I notice that my micranthemum umbrosum has its top leaves turning white, sort of
like bleached away. Then, they start rotting at the top. I've checked out www.thekrib.com,
and it seems like a boron deficiency syndrome.

The thing is that I've been dosing my 4 ft tank with iron and trace elements religiously
every week after a water change. But I've been letting my UV steriliser run round the clock.
Will it sort of deactivate the iron and other minerals?