I grow orchids as a hobby, I looked through all the various fertilizers I have and all that list all elements have small amounts of copper. 0.05-0.08 that being said alot do not list trace elements etc.
When I was doing planted tanks I found a recipe for plant fertilizer and it was a great idea, everything was available through local hydroponics stores. I did a search on Guillard F2 formula (F2 means half strength) and I found some recipes but they looked hard to do, IE needing precise measuring equipment for the formulations.
Doug
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