[APD] What is wrong with these? (pic)

["Seweryn Bialasiewicz" <s_bialasiewicz at hotmail_com>]

Hello everyone,

Would someone mind having a quick look at a picture of some of my plants and 
suggest what is wrong with them? The only thing I could think of is Ca 
deficiency, because that is how the Anubias leaf unfurled. Only some of the 
old E. ozelot leaves end up rotting away like in the picture, which would 
suggest that it is something other than Ca. All other plants are doing fine.
the pic:

http://www.uq.edu.au/~uqsbiala/plantholessmall.jpg
Anubias leaf in question on right, E. ozelot leaf on left.

Tank parameters:
40 Gallon, 2x30W flouoro, DIY yeast CO2
~12 ppm NO3, ~10ppm K, ~1 ppm P, ~.25 ppm Fe, kH: 45ppm, pH: 6.8, gH: 
~160ppm, sand substrate with flourish tabs.

Thanks for any help!

-Seweryn

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