It's hard to overwater on Oncidium growing in bark. I have this plant growing in small scoria and it is outside now. i water it every day. It grows under a tree with filtered light all day, and the color is great. I just got it less than a year ago, and the new growth is smaller than the last one, but I attribute to the drastic change in growing medium (it was in sphag when I got it, and once i saw new roots coming, I repotted it into small sscoria, which probably killed all the old roots, so the new roots is all it's got left, i think). I think it will just take a year to recover and get back on track, although it did not lose any leaves.. But yes, I have it in pretty low light, and I water constantly, so I agree with ES. He knows his stuff, so I'd listen to him if I were you.
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