Well, I had ones that I was told were tubs but they were a much darker blue.
The skirts on these are yellow/green actually, probably need a better picture. Ill get one up soon..
I've seen these in person and they are not tubs. They are a different color blue, have greenish skirts, smaller polyps, and a little bit of a glittery look to them. They are pretty cool.
I have some of these and haven't been able to ID them either. Note the lighter blue ring around the center, and I thought the tubbs were solid blue. What do you guys think? Whatever they're called, they're very nice.