ive had my powder blue for 8 months with no problems although i was lucky enough to find a very good specimen....i keep it in a 100g reef with a orange shoulder and yellow tang....i added the powder blue last as they can be very aggressive when adding new fish if already established....i would say the biggest problem with these fish is that its very rare to find one which is healthy in shops most of the ones ive seen round here are in bad shape......anyhow heres a couple of pics of my guy