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same experience on my 180G DT. i was worried the berghia population couldn't get established. i first introduced a dozen in march, and couldn't find a hint of anything several weeks in. i ordered two dozen more in may.
one night several weeks ago, i found a very fat adult. it does take time IME.
One thing to be cautious of, and something I experienced, if you have a heavy population of amphipods or some of the more predatory inverts, they will consume the berghia eggs. If you have large enough berghia numbers then you’re probably fine, just something to keep an eye out for.