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I just noticed these very dark purple, kind of translucent, cluster of bubbles. I don't have 2 of any of the same species with the exception of hermits and micro starfish.
It's a red kelp macro algae (good one) all your herbivore fish will love munching on it
its a natural treat and they love it looks great too as it works for you cutting nitrates and feeds your fish
wait till it turns into a bush you can trim it and sell it , you can get $15. a hand full