It is a Malu, will stay small and will got into the sand, instead of rock (like Crispa)
Your anemone tentacles count is a little ow for Crispa. Malu 75%/Crispa 25%. Know for sure once he settle down and grow a bit, if he grow. Malu will not get any larger than 6-8 inches.
If a malu I don't think they are really difficult, and their size makes ok in shallower sand bed.
I also find that malu, while not natural to all clowns, every clown I've had has quickly accepted them, even clowns that refused other nems.
They are one of my favorite for mixed reef, easy to control, no rock climbing, smaller size allows buffer zone easily.
I've had a number of Malus over the years
It is a Malu. Classic position, color. I mostly keep Percula and Ocellaris and hybrid of the two. They never have problem with accepting Malu as host. I love wild type Onyx A. percula. Hard to get a good pair and they are so beautiful. Great for small and comunity tank also. Malu are hardy and not to demanding. Does not like a lot of current.
They are internal fertilization, females Malu tank in sperm and fertilize eggs internally and release fully formed baby anemones. You may want to keep more than one and be one of the first reefer able to breed Malu sexually in aquarium.