I bought a bleached sebae when i first got started and kept it under 130w PCs. I tried feeding sliversides, live feeder gupies, krill, and brine for several months.
Strangly enough, after adding some new live rock to that tank, I had a small diatom dusting and the sebae was coverd with diatoms.
A week or so after that, while still covered in diatoms, it$ quickly began re-establishing its zooxanthellae (sp). It has been steadily eating and growing ever since.
It's almost like having the brown stuff on the outside allowed the zooxanthellae time to re-organize.
Anyone ever experience anything like this?