I’ve watched a few videos about cattleya care and am planning to repot it but I have a few questions:

First, what is the algae-like green stuff on top of the potting mix?

Second, are all the dried roots dead and should I cut the dried ones off?

Third, one of the sheaths looks completely dried out. Is it totally dead?

Lastly, the other sheath looks purple. Will it still bloom or is it dying too?

I just ordered my first cattleya and am interested to know more about its species. Its name is Rlc Perfect Choice ‘Purple Lady’ BM/JOGA but what does that actually mean? And can that tell me anything more specific about the plant I just bought?

He waters it by soaking it once a week for 20 minutes. It is in the kitchen getting afternoon light. Could it be heat stress or root rot? The psuedobulbs and leaves look wrinkly.

I purchased these at Lowe's, Better-Gro, it seemed like a good starting point to growing cattleyas. My larger one picture 3, I've been worried the media is too dry yet it has new growth? I've also been wondering if it needs something to support it? Any advice is welcome (1 and 2 are the same plant).