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Here is a slide show of how my green ones divide. it starts with a hole in the center you can see through. when i first seen it i thought it was...
May be not then, but it looks just like the way my green mushrooms split (fission). my red ones do it by pedal laceration.
may be digitate hydroids as well a close up picture would help id this...
Nice diy... wonder if it will work on other pests in the tank....
It looks to me like they might be dividing for you.
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