I had a green brittle star that would move 3 feet (across a 33 gallon in a second or less) and grab a damsel for breakfast, the star ate all 3 damsels in 3 mornings, after that I took it back and bought some keeper fish.
Swollen gills eh? any spots on the gills that you can see, are they pink still or discoloured? Any new rock, coral or fish added that was not QT'd? I know it seems we are not listening but we are and we'd all like to figure this out with you. Normally if the culprit is a crab, mantis etc there will be physical trauma to the body, seeing as this is not the case environmental issues/concerns or disease look suspect.
Doug
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