I'm planning on doing a mini-rescape of my 20 gallon, and one of the things I really want to do is pull out all my rotala and replant them. I got a good amount from an RAOK a few months ago that I just planted together in a huge bunch. The rotala is still alive, but the bottoms half of the stems are leafless and dark. I'm just wondering if there is an optimal way to plant the rotala. Specifically, I'd like to know how many stems per bunch and how far each bunch should be planted from each other so that they don't block the light from reaching the bottom. Thanks.