Look like this?
or this:
Hydroid Jelly Fish. I have HUNDREDS in my fry tanks. They feed on pods, baby brine shrimp, and other micro-crustacean/micro-planktons.
Do you ever see them in the water column? It's harder in a reef tank with 15X turnover. In my fry tanks, which are very low flow, you can easily see them swimming in the water. The typical "umbrella" open and close of a jellyfish.
D
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