Help diagnosing deficiency please?

[Dave001]

All my Sword plants keep ending up with holes through them, any idea on what nutrients they might be lacking?

Tank specs.

120g tank (48lx24wx28h), planted with Amazon Sword, Anubias Nana, Java Fern and Blue Stricta.
Lighting is 1.4 WPG T5, (1.95 WPG T12). Using 3mm aquarium gravel for substrate.

Water specs are:
PH. 7.6
GH. 6
KH. 3
Amonia: 0
Nitrite: 0
Nitrate: 7.5 ppm (fish load keep it close, but I dose it if required)
Phosphate: .75 ppm (fish load keep it close, but I dose it if required)
Potasium: (I can't test for it, but I dose it to 20ppm)
Magnesium: (I can't test for it, but I dose it to 5ppm)

I also dose at each weekly water change
10ml Seacham Flourish Iron
10ml Seacham Flourish
And use Seacham Root Tabs at the base of the plants.

Any way, a picture is worth a thousand words.

Thanks,
Dave

 

[rrkss]

It looks like a CO2 problem to me. The plants just aren't getting enough carbon to really build stronger leaves. I would also increase nitrates to 15 ppm and phosphates to 1.5 ppm, you will see a difference at those numbers. Pottasium is fine but I like to keep mine a bit to the higher side 50 ppm+.