They are extemely delicate but very doable.You need a well established tank that is healthy and stable.Any sutle changes and he'll get sick.If you get one quarintene him first and moderate him closely.If you can here's how I did it.
I ordered one and had him held at the store.I left him there for about a week and a half.I was up there every day watching him.Making sure he was healthy and would eat.After I was satisfied and brought him home, I quarintene him for two weeks.He did get ich so I treated him,waited and then introduced him into my tank.He did fine but did get sick over and over again.It was a hassel and eventually he died.I'm not sure if this helps but it's the only on hand experiance I have.I know others with healthy powder blues and they are so pretty.If you do get one good luck!?!?