The green fluffy plant is Ambulia and is a nice plant.
Increase light and add liquid iron fertiliser. Use an iron test kit to keep iron levels at 1ppm.
You can have the light on for up to 16 hours per day. But start with about 12 hours a day.
If you get lots of green algae then reduce the light by an hour a day and monitor the algae over the next 2 weeks.
If you don't get any green algae on the glass then increase the lighting period by an hour and monitor it.
If you get a small amount of algae then the lighting time is about right.
Ambulia will tell you when it's had enough light. The top set of leaves will close up against the stem, then the next set do it and so on down the stem. Under good conditions, this plant can grow several inches per week. The top set of leaves will also get a red tinge when growing well.