The only response I have is. It was sold as a sebae I understand that could be wrong. However if you check on the requirements of the Ritteri care. I can assure you I don't keep my water quality that clean. Most if not all of my animals fall into the easy to care for categories. A Rottori isn't
Does it ball up at night?
Also FWIW I've never seen a Sebae with tentacles that ball up and have white tips on the end. H. Crispa tend to be more tapered then H. Mags. and have pink, tan or a blueish colored tips. Honestly never even seen one in pictures with those colors so either yours is super special or...
Based on your pictures I'd say with 95% certainty you have an H. Mag and not an H. Crispa regardless of how it was sold.
Also don't believe all the myths about Mags you hear on the internet