I've been thinking about doing this for quite some time... and finally manned up and did it yesterday!
I took Magikarp's tank from this, which was nice.. but I felt it was too cluttered. That anubias took up much of his swimming space so I moved it to my 29G.
Now he has this, I took a smaller slab of wood from my 29G as well as a crypt plant, I also got rid of the java fern and put it in my 29G. Now he has MUCH more room to swim. I also added more gravel because it was a little low before. I've very happy with the results!