Plant nutrient deficiency?

[gy960]

Hi all! I have a few problems with my lace java fern, needle java fern and water sprite . The LJF and NJF have holes in them and i was wondering could it be some sort of nutrient deficiency or what. Whereas the water sprite is browning along the leaf edge.

I dose seachem iron daily, potassium weekly and trace weekly. I dont keep any plecos but do have a couple of otocinclus and zebra nerites.

Lighting: 24w T5 on a 17 gallon.
Filtration: Aquaclear 50
Currently facing brown algae, film algae and green spot algae.

Tank is cycled, thanks if anyone can help me

[barmby]

It does look to me that the shrimps are chewing on the leaves.