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They also kinda just go away on their own with time. I don’t think they can finish the life cycle in aquariumsWelcome to Reef2Reef!
Those are hydroids - similarly to Aiptasia, removal is generally recommended.
It depends on the species (possibly including if they're photosynthetic or not) and aquarium - some go away on their own, some can become invasive.They also kinda just go away on their own with time. I don’t think they can finish the life cycle in aquariums