I just got two new onc. type orchids and their leaves are looking funny. One had little light brown spots appearing on one leaf, I assumed soft rot and trimmed it. The other has leaves of light green color, with very light yellow spottted/mottling on some, but not all, leaves. The mottling seems to be mostly on old growths, but is present on one of the leaves of a new growth. Does anyone know what this is, and if it is dangerous? Thanks.