I found the "hell"acus snail cruising the glass this morning after an evening of munching more of my polyps. Now that the mystery is solved I just have to make sure there isn't any more of them. Thanks for your replies!
Dizzy is on the right track. The Nitrobacter vs. Nitrospira (or other) bacteria debate has been around for many years. Look it up. I guess if I had spent many years and lots of money researching bacteria I would want credit for my work too.
I tried to research this first, but I didn't find anything. I have a recently aquired (7 days) zooanthid colony (50-70 polyps). I don't know the exact species but they are brown with green centers and connected by very thin purple strands. They looked great when purchased and opened right up in...