I don't know to be honest. I know mag tentacles can be rather variable though. The ones I've kept weren't always the same even though they all were healthy. Some have longer stringier tentacles, while others had more rounded blunter types. Pretty much every mag I've ever had had branched tentacles to varying degrees though.
The first mag I bought had extremely branched tentacles, like in the video. The next had no branching at all, and is occasionally accused of being a BTA when I post pics. So it's just a genetic variation if I had to guess.
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