looks like bubble algae, it probably has a small bubble at the end, if so, you should do some research on bubble algae, and kill it appropriately. Don't procrastinate, and don't just yank it off, you need to get the hold-fast.
it disappeared back into the rock. it only had a little piece that was visible on the rock. I guess it's Digitate hydroid that will feed on my Hydroid jellies. I love new tanks, they are so interesting.
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