I think they died from the decay from the feeder aiptasia.
I only fed one small aiptasia per day though, and syphoned out any remains the next day, but with such a small water volume the decay was probably too much, so everyone with berghias left should be carefull of that.
I also fed some aiptasia "bits", maybe stick with whole aiptasias so they are alive and not decaying right away?
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