Here's an old post I made a couple years ago, and recently relinked to...
It's some photos every few months of when I started my tank. As you can see, coraline doesn't happen overnight. But once it reaches "critical mass", it will take off.
A couple comments:
Compact Fluorescent lighting will grow coraline just fine. I guarantee it. In fact, coraline doesn't really like high amounts of light. So 2x 96W will grow it just fine - it does in my tank. (And yeah... even though it looks like 4 tubes, you only have 2x 96W in a 36" fixture.)
If you don't know what your calcium and alkalinity levels are off the top of your head, that is probably a good place to start in trying to figure out why its not growing. You need a calcium level above 380, preferably above 400. Your alkalinity should be between 8 and 12 dKh
. If either of these things is out of whack, that's probably your problem.
Additionally... you need coraline to grow coraline. So if your tank was started with 100% dead dry base rock, coraline just isn't going to happen. It has to come in on something.