Major problems with two vandaceous

[JKeys]

My rhynchostylis gigantea has lots of black spots on it. It also has an interesting looking semi see through yellowish spot with a pink ring around it. Finally, the leaves are yellow and shriveled.

Also, my renanthera has lost a half of a leaf and there looks like there is a little black streak on it. There are also some little indents in the leaves in places.

Thanks.