I believe they are imported from the water column. You can even buy products intended to help corals regain their symbiotic zooxanthellae (AlgaGen’s product PhycoPure Zooxanthellae).
In the Anemone forum, one of the techniques they use for treating bleached anemones is to do a zooxanthellae transplant. Basically injecting a piece of a healthy pureed tentacle into a bleached specimen. It has shown promise for saving nem's that otherwise tend to perish.
Dennis
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560G Miracles tank in process
making a DIY DyMiCo style filter (for 560G)
Current Tank Info: 560G Miracles tank in progress, 80Frag Temporary
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