hello; The relationship between bio-media and fish depends on the amount/size of fish you keep. With very light stocking you do not need much lava rock and so on.I have 3 pieces of lava rock in the filter and a pothos plant. Is that enough bio media?
I do not think the photos plant is doing much to help the cycle right now. It may in fact be using up some of the ammonia, some plants do take up ammonia. Save it for later when the tank is cycled and there are nitrates in the water.