Jmoney -
First, Welcome!
Rather than getting hung up on the details of "which medium" and wet vs dry, packed vs loose, etc... take a step back and examine "what" you're trying to achieve. The "how" will vary depending upon your conditions. For Catts, no matter the medium or container the critical factor is being able to dry out between waterings, and lots of air in the root zone. So it depends on your ambient humidity, temperature, whether you are using plastic pots or open baskets, how frequently you water, etc. There is not one right way... Personally, because I am an enthusiastic water-er and mostly grow outside, I need to make sure that I have an environment where the plants can dry out. My best results come from using large bark, wood (best) or plastic (OK) baskets, and hanging the Catts, especially the larger ones (which exposes them to the breeze) Sphag wouldn't work well for me at all for that group. (It works great for orchids that need to stay damp like Oncidinae and PLeurothallids and Maxillarias) But if you live in a drier climate and/or don't water often, it might work for you.
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