+1 smitty.
My first attempt at chaeto in my fuge was a failure....i didn't have proper lighting (I used a regular 60w lightbulb cuz at the time, i couldnt' find cfl's) Within a month or less, the chaeto was paler and paler....then I poked it, and it collapsed.
I bought a new ball, up'd the lighting to a CFL floodlight that, I think is a 26w that is equivalent to 100w, and it did the trick. I have minimal flow in there--in fact, the flow is just enough to keep the surface rippling. And it grew so fast, that within a couple of months or so, I had to rip out half of it. I sold it to my LFS.
P.S...+1 dcan, too....it makes sense for it to heat up faster, but depends on your flow. As I said, I have MINIMAL flow in there...just enough to ripple the surface, so as you can imagine, the water flowing out is not much. I would move it elsewhere if you can.