Is this worth eating or fighting (for) it? I have no knowledge on how they identify/distinguish food over a rock, if the tentacles have some sort of receptors

Is this worth eating or fighting (for) it? I have no knowledge on how they identify/distinguish food over a rock, if the tentacles have some sort of receptors on them, but apparently this didn't "taste" like food, thus unworthy of eating or fighting for and therefore better safe than sorry.