Aries, how long have you had your cardinalis? I ask b/c mine (I thought is was Alternanthera reineckii but looks the same) took awhile (a month or so) to settle in. I don't have as much light as you and the lower leaves die off. Yours looks very similar to how mine looked initially and may need more time to adjust, just keep pruning off the dying leaves. You might try pinching off a small offshoot and let it float, if that piece does well, then it may just be lighting.
p.s. check your pm
p.s. check your pm
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