I am not am expert, but I seem to be doing OK growing Vanda orchids. What I have learnt is first you have to get the right light, watering and temperature to suit your plant then you sort out fertilizer. Every area is different as are greenhouses. At present I have 50% sola weave to let some sun in and keep the rain out. where I live it is very sunny and can also be very wet. At present it is summer so I am watering my Vanda's twice a day and fertilizing with 1/4 strength fertilizer 3 or 4 times a week. Calcium nitrate 1.5g per litre twice a month and a liquid seaweed fertilizer once a month also 1/4 strength. This is their peak growing time for me I adjust the watering and fertilizing as the weather cools down. Vanda's are worth the extra work but I love being out in the greenhouse looking after them. This is a long reply but basically adjust to suit your situation.
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