They have adapted to my tank very nicely. Got three of them from Sharkys and when expanded, they are at least 7 inches. The first one is more dome shape but the color have really become more intensed. I wish I have a decent digital cameral that I can take some recent pics. I am a sucker for wellsos. By the way, there's one up for sale at Cquarium...if you are into Wellsos, might want to check it out.