Hi the tank is lit by 3 x 400 watt Metalhalide 10000 Kelvin and 2x 54 watt osram 67. I have no problems with the Angels (there are two off them in there one tricolor and the regal angel. But the regal will eat all zoanthus sp. The tricolor has been in the tank from the beginning (jan 2002) the tank was manly set up with soft corals in that time. Since the beginning off this year I'm turning the tank in to manly a sps system. I have no prove but I think that the tricolor angel is eating parasites of sps corals. this is because it will pick on sps corals but I cannot see any damage and it doesn't pick on sps polyps. The tank is set up as a Berlin system. So only a large skimmer capacity 2 times the tank volume (aquacare ,German brand) and 200 kgs off live rock. I'm also experimenting with the Zeovit methode since august 2003 : http://www.korallen-zucht.de/farben.html (you can click on the the English flag ) but for now it is a little bit to early to tell the results but so far I'm very happy with the system.