i hate to be the one to break it to you
but red plants in general grow VERY TALL
in fact, they usually grow to the water line and even out
i've tried ludwidgia arcuata, rotala indica, altheranthera reineckii, c. piauhyensis, and none of them are under 1 ft in height
doing a quick search under disky's plant search engine for plants shorter than 30cm turn up no red stem plants
maybe others will have recommendations though
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