Yes, I just fed him and he is eating, and he is attached to a rock
If it is eating, then that is a good sign. It sounds like it lost some of the zoos like the above poster mentioned. The good news is that even if that is the case, you should have no problem keeping it alive as long as it is eating. The key is to realize that if there are less zooxanthellae inside, then it is producing less of its own food. That means you need to supplement that food. In other words, feed it more often than normal until things look better.
For instance, I normally feed silverside to mine once a week. So I would give it smaller pieces every other day (or every day if it looks transparent). Then as it gains the color back, I would move to every few days, etc.
The question I have is whether the tentacles are opaque or clear/see through? Either way it is the same treatment.
Also, do some extra water changes to make them happy. Did it split recently?
Just as a side note, when I got my RBTA it was pink but transparent. A little TLC as described above, and it became nice and healthy. It decided to split last month while I was on vacation, and the new clone looked a lot more white. I have been feeding it brine shrimp (it is pretty small), and just moved to tiny silverside pieces. It is getting darker every day.
Good luck and let us know how things progress. Pictures would be great.
