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Heatherm, I think a teaspoon is about 3 grams, your using a liitle less than half so that would be close to 1 gram per litre and that is the same rate I use for my Vandas.
For now I would out the Superthrive till you get to the bottom of the problem. It is suspected that Superthrive may be a highly concentrated fertilizer.
Your fert with NPK 30-10-10 is one that I would use on seedlings for quick growth, not flowering size plants. You might like to think about getting one about 20-5-14 (example ratio only, close to these figures is fine).
How often have you been applying the fertilizer????
Oh, almost forgot, I don't think it is a lizard or insect damage.
A photo of the whole plant would be good as well as the roots.
Bill
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