Algae and sphagnum moss?

[nzadro]

Hello,

I was wondering if someone can give advice on how to prevent algae growing all over sphagnum moss? It seems no matter if I grow an orchid potted or mounted, inside an air circulated enclosure or out in my living room, algae seems to be a problem. Moss will be nice and tan, but surely enough, a layer of green will start taking over. At first I thought, "well, maybe the moss is coming back to life", but I am doubting this dream.

I have read this can set back a plant and slowly suffocate the roots. What can be done to prevent this from occurring? What treatments can I do once it does? (I have Physan20 on hand, but have not resorted to it yet).

(Happy to provide photos if necessary.)