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You have identified two of the primary concerns for berghia.
Direct, powerful current aimed at aipataisa rock can blow berghia off the rock into the open water. As long as the powerhead is not aimed directly at the rock with aiptasia on it, the berghia are pretty good at clinging to the rock without being blown off.
If you have aiptaisa on the powerhead, in overflows, and other areas that are hard to reach for the berghia, you should remove these by hand using a razor blade or other flat tool (even your finger nail can work).
It can be a challenge to predict the behavoir of fish relative to berghia. But the aggressive hunting wrasses can be an issue. Berghia have a built in defense that can cause fish that try to eat them, to spit them out. I have seen a large wrass put one in it's mouth and spit it out again.
There is no way to know for sure if a fish will be a problem. If your wrasses are larger fish and aggressive hunters I recommend removing them temporarily from your tank to be safe. If you want to try berghia with the fish in the tank, I recommend keeping the fish well fed.
On the plus side, berghia eat at night while fish are less active and crawl into rock crevices during light hours.
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