Various leaf problems - black spots, yellowing, scratches

[milkygato]

Hi all, my husband and I received some orchids for our wedding. We are both new growers and while I’ve done extensive research on growing orchids, there seems to be a lot of different information out there so I’m happy to become part of this community.

Our orchids all seem to be having different leaf problems that I cannot figure out the cause. Most of them are placed close to the window and receive indirect sunlight. I have a humidifier close by because it’s pretty dry where I live. 4 are planted in moss, two in bark, and I water them roughly every two weeks or so.

Please help me figure out why the leaves are this way. A couple of them have scratches/splits, some are yellowing, some have black spots =(