10k bulbs will work, and will look more like a 'reef.'

I tried 10k bulbs, but I was so used to the 6500k, that it looked too blue for my tastes. I gave up on the ATI bulbs and went back to hagen. I'm upgrading to metal halides soon, and I may end up replacing the stock bulbs if it looks weird to me.

Under 6500k I grow enough dragons breath to prune back every 4 to 6 weeks, enough to fill a ziploc freezer bag. I also grow lots of ulva, which people tell me is hard to do, but it's like a weed in my tank. I get some pretty cool red turf algae when the tang doesn't notice it, and prolifera. I haven't tried much else. It doesn't seem like there are a lot of options for macro around here. The last few times I ordered some online they showed up nearly dead. I'm not sure what other people do for macro lighting, but the non-reef bulbs have worked out for me.

Here's my 'macro' reef. The ulva is hidden by the abundance of dragons breath. The prolifera is in the fuge, and only dropped in as a snack because the tang devours it before it grows. He doesn't touch the dragons breath though.