A little fertilizer as we start the growing season might be good. Always better to apply too little fertilizer than too much.
For Oncidiums, in general - thin roots need more water; fat roots less. The key is to see if your plant is healthy with the regimen you're using. If new pseudobulbs are plump and wrinkle-free, then you're doing great. If you see the occasional accordioned leaf or wrinkled pbulb, then you may be under watering and investigation is needed. Remember that once a pblub or leaf is wrinkled, it won't recover. So focus on new growths for your evaluation.
For Phals, what color are the roots (if you can see them thru a clear pot)? If green, watering not needed. if silvery, then time to water.
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