Aquariumgirl's Nano

[Fish]

I second that, you are definitely doing something right. Have you looked into whether or not they are just yellow polyps? That would be my first guess. Here is a link:
http://animal-world.com/encyclo/reef...llowpolyps.htm
If they are an lps like a sun coral you will be able to see their skeleton.
Cheers,

- Chad