hi to everyone and thank you so much to all the replies!
tanya, i live in quezon city. dendrob here are normally in pots when buying in the flower shop. and i think i am not capable of repotting yet. but thanks for the advice.
actually, i just removed my vanda from the bark coz i can't stand it when seeing the medium getting darker and black on the holes. well, i did it(repot) with my vanda since it got infected before and left black spots on the leaves. i heard it's because of the rain.
i have to leave now...be back tomorrow!