Is this Bubble tips or majano

[oyf709]

I have roughly 14 of these in my tank and was sold to me as bubble tip but they never grow bigger and they don't spread or split. They just remain the same amount and walking around in my tank. I had bubble tip before and they look like every bit of it but for some strange reason they just never grow bigger than a size of a loonie. I have these for over two years now and start to wonder if they are just better looking majano.

Someone might help me ID them? Attached a pic of one of the easier one u can take a picture.