Specimen Cattleya potting mix???

[InspirChid1712]

Hey Guys!

I haven't posted anything in ages! Oops! Sorry!

Anyhoo... I have a VERY large NOID Cattleya in a 10" clay pot that I cherish very much... blooms like clockwork twice per year. Currently it has six spikes of buds after a summer outside on the porch (I CAN'T WAIT! Photos to come!), but the bark has really started to break down. I think it should be repotted after blooming and stay on the dry side until then... but what I would like is some advice as to a good medium. I'd like something that won't decompose for a LONG time so I can leave it undisturbed for years to grow even larger! I think the hydroponic pebbles would not retain enough moisture... maybe tree fern fiber??? How long does that stuff last? Any thoughts or ideas? Thanks guys!!!