newbie adopts trash bound orchids

[Tima]

Four months ago, my husband pulled 2 pots of crowded, squished together orchids out of a garage where they had been left to die. Fortunately, he saved the labels. Unfortunately, he didn't put them back with the plants he unpotted. I re-potted them in new orchid bark into 6 pots. They were mostly green when we got them although limp and stressed. They started growing again when separated. But now almost all are turning yellow. They are in a north window on the dining room table, sitting in a pan filled with large clay shards so they are never sitting in water. He sprays them with water almost every day and I drench them in the sink once every couple of weeks. My husband just told me he was putting the orchid fertilizer in the spray water. The leaves are uniformly yellow with some light dark stippling but nothing that looks like fungus or disease. I cut the worst ones off.
The i.d. tags are: Alcra. Pacific Nova 'Butter Buds'; Mtssa. Dark Star 'The Orchidworks'; and Bak. Truth Silver Chalice AM/AOS. Help!