Hey Kollba,
when did you move to Thailand? I'm just thinking emigrating from Sweden to Thailand 6 months ago will have been tricky!
But makes sense to start with orchids in such a climate. You will have a lot of figuring things out to do - most growing advice I know is for indoor growing. DirtyCoconuts grows outdoors and has just faced some of the issues you have described so maybe he can help more.
If that were an indoor grown plant I would say the purpling is just right, you want a bit of purpling, not too much. Purpling can happen from too much light but also as a result of too little Magnesium. Most of the time it is a combination of the 2, the more light a plant gets the more Nutrients it needs, magnesium deficiency shows first if it is not receiving enough and shows as purpling, lowering the light or increasing magnesium would rectify the problem, since you want high light to promote flowering it makes sense to increase magnesium and keep the light as it is.
The shield lice can very possibly be your only issue - even causing the other yellow spots. I use a strong spray that kills practically everything so cannot recommend what you use in Thailand, I'm sure someone has a remedy for shield lice. They will spread viruses from plant to plant so don't ignore them!
So I mentioned light feeding could help but the pictures indicate a possible PH issue or other water contamination.
So is there any way you can test the PH and the total dissolved solids (TDS) in your well water?
If you well is leeching a lot of calcium into the well water it can cause the PH to get too alkaline and cause a nutrient imbalance (too much of a certain Nutrient will start locking other Nutrients out) so worth checking that your well water ppm is in the range of rain water without too much else added to it (30-60ppm). The PH should be under 6.5
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