I recently put some Green Wendtii in my 46 bow. In a few weeks the green leaves died off and new brown ones are growing up to take their place. I did a big WC, increased the light, and cleaned the canister filter. I think my tank conditions weren't all that healthy, but I'm wondering if there is any particular parameter that makes the Wendtii produce brown leaves instead of green ones. When I got the Wendtii, I put some of it in a different tank and there it has remained green and vibrant.