Couple comments,
The glasses are not an ideal growing container. You NEED drain holes.
Those other black nursery pots are great, get more of them.
What's up with the hydroton mixed in your soil? Kind of unusual. Not necessarily bad for the plants, just odd.
I wouldn't try to add humidity. You say the air is already muggy; even with a/c you're not going to get into the dry danger zone.
The purple veins and pale leaves indicate a nutrient deficiency.
The soil looks very moist but I can't tell really from the pictures. What you may have going on is soggy soil combined with a pH problem, which would cause deficiency symptoms by making several nutrients unavailable to the plant.
You mention you are using coco+lime; why the lime? Is it because of the 'put the lime in the coconut' song? Sorry, couldn't resist. But seriously that could be the problem.
Are you testing your pH after application? I was under the impression that commercial coco media was already pH balanced.
And finally, what's your nutrient situation?