Powder Blue and Urchins

[saltyreef]

Hey Guys,

I just picked up a powder blue tang about 5" and two urchins. I am unsure of the kind of urchin. The one is a long fine spine and the other is a short spine. I am just curious what you would feed and how often. I am feeding the tang Nori right now and that is it. I was thinking about getting some raw shrimp and that sort of thing and blending it up and freezing it. Then feed small chucks of it. Any help is appreciated, also how often do you guys feed??