I have some question regarding re-potting my Mtda. Maui Charm 'Sakura'. It looks as though it needs to be re-potted, but I'm not sure what the best type of medium is. Right now I have on hand medium fir bark and medium charcoal. Is that going to be okay? Also, it's in a 2" square plastic pot. The smallest pot I have is a 4" round, pot with slits in the sides. Would it be okay to re-pot in a pot that big? I have no idea what I'm doing with this orchid! Any and ALL help will be much appreciated! I need all the help I can get!!