Any Idea What This Is?

The lights came on a while ago & while checking her I noticed this on 2 leaves. I've looked online, but cant seem to see what it is.
Im using all Biobizz in a 19liter fabric smart pot. I've been feeding her 3 liters of water with 3ml of Fish Mix, 9ml of Acti Vera 6ml of Bloom 3ml Top Max & 3ml Plagron Algae Bloom.

Any & all help is greatly appreciated!

 

Thanks for the reply. I realized I had her too close to the cfl & it was burning her.