Oncidium help it/they are a NoID.

[TiffanyP]

I have decided to give away my Odonto NoIDs and some of my Oncidium alliance because I cant give them what they need to get them to bloom/rebloom as nice as the growers do, which tells me I cant have them. I have kept a few out of pure love and this is 2 that have with the same problem. The purple Odonto NoID is in a relatively medium grade media with fur bark, some fine regular bark, some small chunks of Charcoal and some more soil feeling dirt. I water about once a week when the soil is damp. Should it dry more? It has the root rot as well, just like the pick of my red NoID.

This pic shows the red Oncidium NoID, it shows identical to whats going on with the purple. What can I change? i water both at moist level in the mediums.