I have POTHOS in my sump tank, inside the stand (darkness most of the time). It is only 2-3 weeks I started this experiment to see if pothos is able to survive in my sump tank, and I can already see the plant is growing nicely, roots are spreading a lot and the new steam and leaves are much larger in size and growing fast.
I am only providing total one hour of lighting for the whole day, I have kept a timer for the lights within the stand. I found this to be sufficient for the plant and I didn't want algae inside my sump due to continuous lighting.
After a week or so, I will share my findings on (any) effects its having on the water parameters, mainly nitrate levels.
A pic attached for reference: