We bred Berghia nudibranchs on a commercial basis back in the late 90s. The real problem was supplying enough Aiptasia as food to the brood stock and hatchlings. Just a couple of observations - extremely large Aiptasia are relatively unaffected by the nudis. We speculated that the larger anemones had a tougher hide to penetrate. Add Berghia carefully - hungry fishes will try to gobble them down if they are introduced in light and allowed to sink to the bottom - we suggested that they be added in darkness. We bred them in quart jars. The spiral egg cases float and can be transferred to a sterilized quart jar. Daily water changes are necessary, in my opinion.