Plants look like they have burnt edges...

[ashska]

Please help! What is going on with my plants? My tank has been running 5 weeks now and the plants have been doing really well until a few days ago. Is this an algae issue? Plant deficiency? Lighting, co2 issue? I do 50% water changes twice a week and have a ‘clean up crew’ for livestock at the moment.

Thanks in advance for any help!

 

[Slaphppy7]

Potassium deficiency, perhaps?

 

[ClownLurch]

I’ve been researching similar trouble these last two weeks or so. My Java Fern are looking more n more tanned, Bacopa looking similar. All my research seems to point to a lack of Potassium as I use Seachem Flourish. They even do their own Potassium supplement.
What’s the general opinion on here?

 

[Sgooosh]

Potassium deficiency, perhaps?

gosh that is an AMAZING diagram! i am saving that if you are ok with it?

 

[ashska]

Thanks for the input guys. That diagram is really useful. It's hard to tell what's going on. I thought at first it was diatoms since it is a new tank and had it before but I cant rub the brown stuff off like you can with diatoms. Judging from the diagram it looks like it could be potassium deficiency although the rest of the leaves a still a vibrant green. Phosphorus deficiency could be another possibility as the rest of the leaf is green. I use TNC complete fertiliser twice a week (when doing the water changes) so thought there should be more than enough nutrients?