from liveaquaria.com I bought yellow colony polyps, and fluorescent green mushsrooms. They've done fine in a 40gallon breeder with 2x96 watt PC
's, half 10,000k, half actinic03.
I also added some kind of brown button polyp, and it's done well too.
my rose anemone, however, died in 3 weeks.
I find liveaquaria.com's light requirements and difficulty levels are pretty accurate, so you might wanna just browse around there a while. most mushrooms and soft corals aren't too hard to keep. However you only have 186watts over a 90? only 2wpg...not sure what you'll be able to keep with that level. Maybe some mushrooms...