The tank is a 20g with a 150w MH on it. I have had it set up for around 3 months. I know it was much too early for these corals in the normal scheme of things but they were given to me by John at reefcleaner.org. They did go through a 3 day mailing process so I am sure they were under quite a bit of stress. They seem to be somewhat coming around, new buttons are showing on the one piece.