Plant deficiency?

[boyen]

Hi Guys,

One of my plants, a radican sword I think, has a few leaves that look burned. See attached image. Any clues what this could be? It's only the leaves reaching the surface having the problem. My Anubis has some green algae leaves problems. My crypts look really great but older leaves tend to get small holes.

My current setup:
30 G
2x24 T5 lighting on for 9 hrs/day
0 ppm NH4, 0 ppm NO2, 25 ppm NO3
2.5 ppm phosphate, 25 ppm potassium, 0.4 ppm iron
Roottabs added every 4-6 months
PH 6.80, temp 78F
Macro and micro dosed every day
50% water change weekly
Eheim Prof. 4 600 canister filter
CO2 injection: 25-30 ppm

 

[Bert2oo1]

Once the leaf reaches the surface I recon the light is drying it out and burning it. Those t5's put off some good radiant heat and might be enough combined with water temp to push it that little bit too far. Certainly not a deficiency [emoji106]