Anubias new growth showing deficancy

[Atxpunx]

New growth is showing transparent leaves around the outer edges. About a quarter inch in. What type of nutrient could it be lacking? Thanks for any help.

 

[aqua_chem]

Are you dosing flourish or anything of the sort?

 

[Atxpunx]

Yes I am. I actually just picked up some potassium nitrate ( stump remover ). Flourish is dosed weekly. Do you think it's a macro or micro thing?

 

[Atxpunx]

I've decided to up my flourish dose to double what I normally do. Has anyone had experience with potassium nitrate, and how much to dose? I guess I'd just keep testing for nitrates.