Unknown genus (Dendrobium?) with mold/fungus?

[Doom4life]

Hey everyone,

I bought an orchid about two weeks ago and haven't had a chance to repot it into a mix of bark, charcoal and perlite. As I was inspecting the roots, I found turqoise/bluegreen color specs that look like the kind of mold that grows on bread. It also has white specs on the roots. I'm assuming it is mold since the moss just keeps the moisture in, but what should I do before repotting it (aside from clipping the bad/dead roots)?



Also, what causes the leaves to have yellow areas (as shown in the pictures below)? I have another phalaenopsis that is doing the same thing (thought not as severe), except a new leaf is coming out.