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I don't think aipista look like that and I had mushrooms and sponges looking like that before bit if you touch it with something I believe aipista will close in fast
This is the only better pic I can do it seems to like the high flow part of the tank when my rock was somewhere else it didn't oped fully but as soon as it got better flow it opened right up
Balanophyllia would be my guess. See if it will take prepared foods....edit that...didn't see the last picture. Interesting. Looks like a yellow aptasia, though I've never seen one.
When they retract they invert themselves if that makes any sense they pull into the rock and when I look at it they have no tenticles showing just a smooth sorta bowl shape