yellow polyps

Oh they are not that hard to kill I have had them die back on me. They are a good indicator that your water is good. If they are very healthy they do well, but if they are dying back then they don't like where they are or your water chemistry is out of whack.
They do like lots of light.

Bill

[Bugsy]

This is what they looked like when I brought them home and now they are so very tiny and do not fill the rock like this at all. I moved them thought they would like it better but nope just not happy there at all.