Planted Tank Guru
Join Date: Dec 2012
Location: Hot Springs Ar. 71901
Not sure about this part but the appearence of the tank looks as if it's a 75g tank.
That light is too close or if it can be adjusted by a dimmer switch turned down some
or get rid of the slow growing plants. The light being too close is only if the plants are slow growing because their leavers last much longer than faster growing plants and under high light they will accumilate algae of the type you see on them.
Also if there are more than just that one plant leaf which has holes in it you likely don't have enough Potassium in what you are dosing for ferts as usually that is a sign that the plant is actually canibalizing it's older leaves for the Potassium which it needs but is not getting.
The shortest distance between any two points is a straight line...in the opposite direction...