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Relax - you're in the middle cycling your tank. The brown stuff is just diatoms if my memory isnt failing me. You're going to encounter many different types of algae as your tank matures in the first year. Know that it's going to happen, and avoid the urge to throw a ton of whatever is...
Kirsty,
Most urchins are quite omnivorous, with only a few exceptions - and even those are occasionally suspect. Follow the info in the FAQ with regard to the relatively safe species - which doesnt include pencil and slate urchins. HTH,