I've used denatured poultry manure pellets on my catasetinae to great effect; of course they can take as much fertiliser as you can give them in the growing season. I am also using horse manure as a potting mix layer with great preliminary results. Not sure if the guano is a top dressing or a mix, but if you can stand the smell ( if any ), then you should try it out on those orchids that appreciate fertiliser.
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fine print - anything I say cannot be used against me and ymmv on any growing advice
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