Aquatic plant deficiencies?

Hi everyone, I have a 75 gallon planted tank with a Fluval spectrum led light, eco complete substrate, and some basic plants to start off with like anubias and swords. Recently I have been affected by a brown algae outbreak on the rocks and all the leaves of the plants, I have ordered some nerite snails to cope with that problem because it looks hideous as of right now. 

However looking at my plants I am not sure if there is anything else wrong with them, a lot of them are covered with a brown coating or brown specs, but some of them look like they have a little bit of yellow.

 I add Flourish once a week, I do not run CO2 but do water changes once a week, nitrates usually run around 30ppm before the water change. I will attach a photo example below. Thank you for your help