I was at my LFS
yesterday, the guys there are very knowlegable. They have around 1000 Kenya trees split into a number of their frag aquariums throughout the warehouse, so I asked them about care for them. They said there are a few things that a Kenya tree will thrive on.
One is, they don't like the salinity as high as most fish... more in the .21 to .24 range. They do like lots of water movement, preferably with the powerhead aimed at the tree. They don't like to be too close to other soft corals. And they need the tiny phytoplankton to survive, they recommended a product like Marine Snow (or equivelant). They said also to beware of some snails and such that might feed on the Kenya tree at night, slowly stressing the coral over time.
Not sure if this helps you or not, but figured it was worth a try.