Good Luck on your catasetum growing ! sounds like you are hooked.
I move mine outdoors in Summer and top-dress with poultry manure granules, bone meal and blood meal - at varying times. I also am using fertiliser baskets ( on e-bay ) for nutricote granules. With this regime, I don't have to bother with mixing other water-based fertiliser and can use the hosepipe/ rain water freely.
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fine print - anything I say cannot be used against me and ymmv on any growing advice
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