Repotting is stressful to orchids. You can repot very carefully and everything is ok but then you can be very careful and things go awry. The act of taking the orchid out of the environment it is used to and changing the conditions it is used to induces stress and also causes tiny cracks in the velamin around the roots which allows water to escape. And just the act of bending the root back and forth causes these tiny cracks in the roots themselves. Best to repot an orchid dry than when it is full of water. Changing the environment also changes things like pH. But orchids are resilient if nothing else. With sphagnum moss mixed in with the other media be careful to not keep them too wet. The moss holds moisture for an incredible amount of time. Moisture is ok but not wet. I would like you to try a little experiment. Let the orchids dry out for an extra day or two. Until you are sure they are as dry as can be. Before you water them, lift them up and feel how light they are. Get a good feel for their weight. Now water them really well. Now lift them up and judge their weight. Really get a feel for how heavy they are. Lift them a couple time during the day. Now let them dry really well again. In a few days lift them up and feel how light they are. When you have judged them to be really dry again, water them and feel the difference. You'll be amazed now how well you can judge when they need to be watered. You'll be able to walk by them at any time and know when they need water. Your hand is very adept at noticing the difference. Better than your fingers or lips.
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