Glad you are happy with your choice in the end.picked up my new phoenix 14k bulbs today and I am very impressed so far
mnat said:We have always kept our cleaner shrimp in pairs, they seem much happier that way and they are hermaphoditic so you don't have to worry about sexing them. Ours are pregnant constantly and releasing their eggs into the tank which the fish love. Fire shrimp are the same way and ours become much more active when we have pairs. Our current pair hang out in the front of our tank in plain view which is awesome.
I love the pheonix bulb too, they provide such a nice color. Good luck with the achilles tang, it sounds like you have the setup to keep him in and have done your research.