Hello all!

Could some tell me if I am on the right track here??
My crypts (several varieties) over the past week (after 3 weeks of green
water) have developed translucent spots and patches, with some of the leaves
also curling lengthways. Now some of the leaves are disintegrating off their
stems. Does this sound like a K defficiency? I added some extra Sera Florena
yesterday, but so far, no change.
My tank:
DIY yeast CO2
2X30Watt flouros (dayglo and Powerglo)
150L
gH 6.7
kH ~3
pH ~6.8
I also have some flourish tabs in the substrate beneath them.

Any ideas??
Thanks,
- Seweryn