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Return of brown jelly, and unknown worms


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Last year my tank had a brown jelly outbreak that killed about 20% of my corals. At that time I looked at samples under my microscope and saw the Helicostoma nonatum ciliates commonly associated with brown jelly. It took about a month to get things cleaned up and my tank back to good health.

Today I saw symptoms of brown jelly on a hammer coral that's already lost about 3 heads this week. I took another sample to view under the microscope, and sure enough I found those same ciliates. However, I also found some much larger worm-like creatures swimming rapidly in the sample. Any ideas what they are, and if they are good or bad? See this video from a single drop of water:


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