As for the berghia, I've heard that some pods, and bristleworms eat them and their eggs (which may account for why yours aren't multiplying?), and that even aiptasia will eat the larvae. Filtration also can harm the larvae and kill them.
Perhaps try breeding them in a small barebottom tank with no predators, and feed the larva small aiptasia until they are big enough to mow down the ones in your tank?
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