The red is all about higher lighting and low nitrates... maybe the smaller tank has more more nitrate available than the 37?
Here are some pics
Coleallensmom said:Thanks, Roy! I have Ludwigia broadleaf in my 37 gal and I thought what the heck...I'll give the narrow leaf a try in this tank. I will be happier once the chain sword has spread it's way across the entire front of the tank; half way there!
Is that some rotala wallichii in the first pic? Very nice!