Hi there and welcome! I am not experienced with Osmocot slow release pellets, but ordinarily if you have slow release fert you put it on top of or mixed within the media and the plant gets a bit of the fertilizer every time you water it as the water washes over the pellets. That might be a great way to keep your coryanthes well nourished since you're watering it so often. I'm not a very experienced coryanthes grower but I have had one of these for about 3 years, it started very small and has gotten big. This summer it finally put out a spike. I ordinarily keep it pretty moist with high direct light and fertilize it more than the other orchids, which can be a pain! Fert pellets is a great idea, might have to steal that. I can understand that coming from carnivorous plants anything seems like a lot of fert so maybe the pellets are a good start. I wouldn't overthink it. The humidity and temps seem ideal for this plant.
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