Help! What am I doing wrong with my mounted orchids?

[jmera]

Hi,

I think I'm killing my mounted orchids and I have no idea how. This is my first time growing orchids. I purchased two mounted orchids (I am not sure what kind they are), one was supposed to flower in September and never did and the other is flowering now but the flowers open and fall off rather quickly. I checked online and this forum and it seems to be a product of over watering. However the roots don't look over watered, they look really dry if anything. Also I read that its really hard to over water mounted orchids. The older stems have also shriveled and look really ugly, nothing like the pictures of healthy orchids I've seen. Ok so here is the skinny, I am presently living in Fortaleza, Brazil. The average high is 86* (30), average low is 73* (23*), and the relative humidity is about 70%. They live on the balcony where they get indirect light and constant ventilation (I live a couple of blocks from the beach). I've been spraying the plants daily, mostly in the mornings around 7 am. Sometimes I forget and spray them at night (now I realize that's a no-no). I also trimmed off some funky looking stems that from looking through the forums could be a fungal infection. I have no idea what to do with the poor little things. I don't want to kill them.

Thanks for any help in figuring out how to get them healthy and any ideas on what kind of orchid the flowering one may be