brazilian pennywort issue

[Cliffz]

Folks,
I noticed today my Brazilian Pennywort seems to be rotting around the edges of some leaves? eroding away very little,This is aside from my black leafs on my Java fern.
55gal
Greg watson ferts
9hrs 2x65w light
any help is apreciated.

 

[Lonewolfblue]

Where are the Pennywort located? Could be not enough light, depending the placement. As for the java fern, is it a black algae on the leaves or are the leaves turning black?

 

[Cliffz]

Leaves turning bleck with some pinholes--Some of the brazilian is shaded by leaves of itself. Otherwise plenty of light and good growth on most of the plant.

 

[Lonewolfblue]

Pinholes is a Potassium deficiency.