The potinara will not get very large. Most are fairly compact. The mini cats are hybrids using potinara as parents somewhere in their lineage. The "eyes" or growth buds are at the bases of the pbulbs and when they start growing, and get some roots, that is the optimum time to repot them. They can be repotted as necessary but I would wait until the new growth has some roots. I like small to medium bark, perlite or sponge rock along with some charcoal as a media for potinara and I like it for milts also. Milts like an airy media. Their fine root systems do not like to be kept "wet". Just damp. And that is facilitated by using an airy media. My Wilsonara is in this medium mix and it is doing well. Milts don't like to be repotted very often just like most oncids. The roots are very fine and easily damaged. I take mine out of the pot by laying the pot on it's side and gently pulling it out. Then I take a hose and spray the media away. But as yours is in moss, I would use tweezers and gently pull as much of it away as I could but it's not necessary to get it all off. When repotting make sure you put something inorganic in the bottom center of the pot to lay the root mass on top of so the roots are splayed out and just pour the media on top the roots. A plant clip will facilitate keeping the plant upright in the pot until the roots take hold. The optimum time to repot is when the roots of the new growth are about 1/2 inch long. Be very careful of the new roots. Do not damage them or they will stop growing.
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