I wish I had seen these six months ago. I spend about $300 trying to breed them, but didn't get very far. They ate a few aiptasia, laid eggs, eggs hatched, but one by one they died and none of the larvae matured.
it would be fun to take a 10 gallon to my office and try to breed these things. Maybe divide the middle with a partition, use one side for the nudis and one side to breed apistias.
As to their location, the article explained
:
"The genus Berghia is widely distributed circumtropically in warm and temperate waters."
and
"The most prevalent stock of Aiptasia-eating nudibranchs in the American trade, however, is heralded as having been collected from the Florida Keys (east coast USA)."