Maybe aphids?
http://images.google.com/images?q=aphid
http://forum.bonsaitalk.com/f13/und...help-25571.html
http://forum.bonsaitalk.com/f7/cont...story-2242.html
These are just two of many threads on fukien and aphids. Fukien tea is very prone to catch insects.
Some measures when you see problems (from what I've read on the posts):
1. Mechanically remove them (your water jet, or shake the plant so they fall)
2. Soap solution
3. Repeat soap solution two weeks after
Preventive (after you get rid of the problem):
1. Not too much watering, not too little
2. Systemic insecticide. I have fukien teas, and have kept them well by using the "complete solution" kind of fertilizer/systemic insecticide/disease prevention type of product made for roses.