It now appears to have sweeper tentacles. It’s in my refugium and has been stationary for many weeks. The main body is maybe approaching nearly a quarter of an inch. I’m about to “when in doubt take it out” now that it appears to have tentacles, but it’s pretty darn cool and if it’s not a nuisance I would leave it. I do have a hermit and a turbo snail that I’d like it to leave alone. Thanks for any thoughts or ID.