I don't know if this will help. but have a look any way.
Aralia Fabian (Polyscias speices) has a few pests that can cause wilting and a general decline in the plant. Those pests are spider mites, mealybugs and root-knot nematodes. I am ruling out the possibility of mealybugs because – mealybugs are visible to the naked eye and not present in the picture. Spider mites, however, are not visible to the naked eye. You will need a magnifying glass – look at the backside of a wilted leaf and a healthy leaf – if you see activity on the leaf, you have spider mites. In this case, you will need to spray the Aralia Fabian with an insecticide. Your local garden center should have a houseplant spray that is appropriate for this situation. To check for root knot nematodes, you will need to see the roots. Since this plant is grown hydroponically that should be easy. If the roots have a swelled appearance, you probably have nematodes and will need a nemacide. Your local garden center can help you find the right nemacide for this situation.
You will need to trim out any of the dead. When you depose of the dead material; do not put it in your compost pile – put it in the garbage. Clean your pruning shears with a light bleach and water solution after you finish trimming the plant.
Once you have corrected the problem your Aralia Fabian should make a full recovery.
Source
http://www.flowershopnetwork.com/blog/aralia-fabian-in-distress-why/