Hi Ari,
Great info and thanks for sharing. That's saying a lot because i'm not a fan of stem plants! I only keep two out of an excess of 50 types.
Just to parrot, R macandra is a very hard plant! I always thought lower temps <27 was very important. It is i think a prerequisite for big healthy blooms. Most of the sifus say 25C.
I think you just made it a challenge for me
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though i'd put this plant in the feminine plant category together with M. umbrosum.
I'd agree with you if you can plant this the other rotalas are similar and less demanding except for certain characteristics you want from Rotala rotundifolia green. More light to make it drape rocks ala Amano.
Regards
Stan