Mark - Aside from water + feeding, any issues with rootspace.
I have my regulars singles in 15G and I also doubled up *per you post/observations* as well in my 15. Just looking at the singles in the 15G (in which the rootmass is literally ontop of the medium and also poking through the bottom of the fabric pot). I can only imagine how dense the root is in the plant medium on the ~doubled up~
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