Thanks for your responses.
The tank is in my house, there is only a small opening in the barrel where water drips in and I pump it out. I don’t mix anything in the barrel, it’s just pure water.
I grow in a room in my house I converted into a grow room, under lights, with a small fan blowing all the time.
Attached are some pictures of the spots. These are all new plants which started exhibiting symptoms so quickly all I can guess is the water. I’ve pruned none, repotted few, so I don’t think it can be a virus, although my heart sinks at the possibility. The cattleya is a seedling from sunset valley orchids and very new. The new growth is the one with the spotting.
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