We have a 4x65w PC fixture and a 2x40w NO (T12) on our 90g and our zoas grow well. Their colors aren't the best (ones that should be green are more brownish in color), which is one of the reasons why we're working toward switching to T5 HO. But, they are reproducing and spreading (they are all in the upper 1/2 of the tank). I use to target feed them when we first got them, but I've since stopped now that we have more fish in our tank (everybody's a thief in our tank even if they get fed first).