Spoiled clown
I have a juvenile maroon that does the same thing but just when the lights are off. There is no anemone in the tank and I finally realized that where he sleeps there is a cluster of airlines, heater and power head cables, as well as the string for a magnetic glass cleaner. He had simply adopted the tangle as his own personal artificial anemone.
When the lights come on he tears around the tank like he owns it.
Most times my fish seem to be smarter than me. :frustrat:
He is getting a blue tipped anemone as a belated Christmas present! :^: The pet store owner tells me her maroons love them.
Cheers