Mostly I have dendrobiums. Don't ask for the names. Most plants sold here are sold 'nameless'

. I'll post some pics asap for some help on names?
Anyways...I also have some cattleya or blc and vandacious ones. Though most of my plants bloom regularly 3 have not yet bloomed since I bought them almost 2 years ago. What could be the problem here?
Lately spots like yellowish discoloration have formed on the leaves of my dens??
For clarity I will post some pics very soon

!
Thank u for all the (very) quick comments. I really appreciate it.
