3 New Orchids - Help

[LAorchid12]

I am new to orchids and impulsively ordered 3 new orchids which arrived today.

1. The first 3 pictures are Den. farmeri. This one is a little pale looking and does not look as robust as the other two The potting medium is moss and is really dense, wet, and has some algae and other growth. That being said there are a ton of good looking roots. Anything special I need to do for this one?

2. Picture 4 is Epi. floribundum. . Is potted in moss as well but I suspect it was a recent repot because it’s in a large pot with loose moss and not many visible roots.

3. Picture 5 is Den auriculatum. I can’t really tell what medium it is in because the root growth is so dense

I’ve been doing my research but any advice would be appreciated (especially for the den. farmeri

Thanks!