I shouldn't post this for millions to see, but if we were talking face to face... Lots of people have BTA's under PC's or VHO's, so I know it's possible. (Mine, didn't care so much for it), but take a pic of it the day you get it (or move it), then keep verifying the color... If it appears to be losing color, then the light is not enough and you can move it back to the tank with halides, or take it back to the LFS.
Are your clowns being hosted by anything right now??