I would leave the Java Fern, it is not looking bothered. The Java Moss on the wood is a nice addition to an aquarium and I would leave this; I have found both these plants do not like changes, but if left alone they may suddenly (after a few weeks) begin to settle in and turn out quite nice. Moss is especially beneficial for fish, they love browsing through it for microscopic food critters.
The amin thing is to reduce the light period. This is going to have issues for the Wisteria too if you are not careful. Once you have the intensity and spectrum (and we can assume these to be fine), you can have a little as six hours. The plants will photosynthesize during the "daylight" period, and then when light is off go into their rest. The problem with 10 hours, somewhat depending upon the light intensity, is that nutrients may become exhausted, and then you will have real algae problems.
Plants grow by photosynthesis, and if the light is of sufficient intensity and spectrum, and the required 17 nutrients are available, photosynthesis will be "full out," so to speak. The plants naturally make use of this ideal setting to grow. But as soon as one factor becomes exhausted, photosynthesis will slow, and that is when algae can take advantage. Keeping the balance of light/nutrients is key.
Carbon (as CO2) is likely the nutrient that will first become insufficient. CO2 is produced all the time from respiration of fish, plants and some species of bacteria, but it s primary source is from the breakdown of organics in the substrate. During darkness the CO2 increases, and then during the "day" when the tank lighting is one the plants take upo the CO2 (and other nutrients). But there is a limit to the amount of CO2, and you do not want to go beyond that limit.
My tank lights are now on for seven hours every 24-hour period, and since doing this schedule I have not had a single algae problem, something that used to be a nuisance in this or that tank from time to time.
On the ammonia question...aquatic plants prefer ammonia/ammonium as their source of nitrogen, and they take up quite a lot of it. Faster growing plants use more, obviously. Wisteria is a stem plant that is fast growing once settled. Floating plants are even better--often termed "ammonia sinks"--because being at the surface they have the aerial advantage which is the assimilation of CO2 from the air, and for aquatic plants this is four times faster than having to assimilate it submersed.
