Mini Phals?

[Lavendula]

I saw the loveliest little orchids with the roots rotting away in the grocery store so I grabbed them. Apparently they are mini phals, so I'm wondering, do I treat them the same as regular sized phals (potting medium, fertilizer, basic care ect.)? They are growing in moss (and flowering beautifully), but desperately need to be repotted as I see a little root rot and the moss is really broken down. They are quite top heavy - very much like my dend. I usually use a bark mix for my phals for good drainage as I sometimes over water and have a high humidity in the room my orchids are in. So I'm not sure how to proceed. Any help is appreciated!

(will try to post pics in a short while, my cam batteries are charging )