It`s looking pretty good Corin. Try not to let the E. tenellus become too dense or you will find algae threads appearing on that too. I don`t know if you have any Amano shrimp, but they should keep the wood spotless as their preferred choice of algae, but will also have a go at threads on plants. They do in my experience, anyway.
I always experiment with diffuser placement so that I can get maximum dispersion of CO2. I have always found having the diffuser under a vertical spraybar to be the best.
Dave.