sponge

If a bubble tip anemone moves, that can make a hobbyist nervous.  It could sting some corals, or get sucked into a pump's intake. In my anemone cube, that's nearly impossible.  Today's event was amusing because not only was the creature shifting to a potentially better spot, but the clownfish were going along for the ride. They were unwilling to accept the change, even though there are plenty of stationary bubble tips available throughout the tank.  Here are a series of pictures from this evening's meanderings.