I am not a "halide people". I do have both T5HO and MH but none of my 3 duncan did well under T5, but are thrving under MH...go figure.

Mine grew 7 heads to 60+ in 3 months but I do feed them few times per week. Yes they can pop heads very fast and a lot of them...they take forever to grow new shaft.

Duncans seem sensitive to chemical warfare, mine got pretty ugly at one point when I had a leather coral nearby. It took some time, but it came back after I got rid of the leather.

I have three that do well under T5. I had one that closed up for two weeks and couldn't figure out why. Healthy and eating like a hog one day and closed the next. I wrote it off to a regenerating mode of some sort until.................... one day I saw the problem...Damn pecking of my Coral beauty.. I only saw him do it once but I'm sure it was more just that the Duncan may have decided he had enough and because he was closed most of the time the fish would give it little attention and if I never caught him giving it a little shot that day I would have never known the better. Coral Beauty is now gone and the Duncan is out happy as ever.
If you notice one of the fish lingering around sort of checking it out yu may have found the problem.

20" deep tank.....they are on the bottom of the tank..... lit by T5.....110g tank with just over 10000gph of flow.....oh! and they are mostly shaded by an over hang........:wink:
http://i116.photobucket.com/albums/o...2/IMGP5513.jpg