The thing is, your system should be "mature" or at least thru the first 6 months' worth of algae cycles, and has good steady water quality that doesn't change much. The light will be fine for your 33 to keep any colour of BTA, and people seem to have had success with a Sebae or two as well using PC lighting, but I wouldn't recommend one for a beginner.
In fact, many will caution you to have your tank running for up to a year before adding any anemone. When the LFS says many die after purchase, it's because people often take them home before they're in a good position to care for them. That's why you wil hear the "1 year" guideline - it's pretty safe that after a year, you'll have some good experience and will be able to provide a suitable environment for a fairly challenging animal to keep.
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Alan
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