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It's hard to get a sense of scale from your picture. How big is it? It doesn't really look like a majano. Majanos have bubble tipped tentacles. Looks more like you have lucked into a nice anemone.
I agree with Sniper. Too many tentacles and too big for a majano. The reason it moves around when you redecorate is it has to find its new happy place.
I think you have lucked into a good nem. Will be interesting to see what it grows in to.
Ok so it's now confirmed as a majano,
After splitting I now have two golf ball sizes ones in my 10g.
Shall I leave them alone?
One is host to my porcelain crab
I had some that were green with red tips. Pretty nice, but they sure do multiply quickly. I would nix them. Get a bubble tip for the anemone crab. At least you can sell them when they split.