If you're still looking, I have some pulsing xenia's (i guess you know them as pom pom's?) that are stuck to a rock that's about 2.5" by 4" in size - I'll have to check when i get home for sure but they are about 3 or 4 branches and just won't grow in my tank... my water is too clean :/
To be honest you can have them for free if you want to drive out to me - I'm in Sherman Oaks. I'll take some mushrooms or zoa frags if you wanna trade but nonetheless you can have them for free. It's just in the back of my tank under some light but out of view so i feel bad for them. Don't want them to fade away...
cheers
