Hmmm it could definitely have to do with the light shining through the leaves, but mine don't show up red even in pictures. Perhaps I am not using a good setting on my camera? I'd love to plant a very bold red but it would never make it in my tanks! And before you say it, I don't have the $$ or time at the moment to go high-tech

I planted the sunset hygro in my 5.5 and 30g tanks, it and the 'rosanervig' i already had in both tanks have really bright pink leaves on the tops of the stems. I still have more that I want to try in the 20, I'll be curious to see how the pink looks in there compared to the other tanks.
I know you're excited about starting this tank so I'll be waiting (as patiently as I can) for pictures of the progress!