So this is a Cerianthus tube anemone. We don't see them all that often. I found this one about 120 feet out in the sand, and I've talked to a tech diver who said they're usually found at 150'+, which is beyond the standard recreational depth of 130' and shallower. We used to keep them in aquariums and they were fairly hardy, but they can take up a lot of space in the tank, clownfish generally won't go into them, and they are kind of nasty... I had a customer who said her's was actively hunting and eating her fish and I hadn't see that before so I went for a visit and saw it first hand. When a fish went near you could see the tentacles all move in the direction of the fish. There was no need to make contact, the tentacles would all sway towards any movement. Apparently they are fairly predatory for an anemone.
On my previous post I did not name the fish. It was an Oval Butterflyfish (Chaetondon lunalatus). These fish are one of Bob's favorites.