Thanks for the reply. I upgraded to a glass and ceramic diffuser in Dec 2012. It made a world of difference. I've been very tempted add pressurized CO2 as I have access to it cheap being in construction, but I'm leery about having a poisonous gas in the house with my family. The Anubias I attached to the large driftwood the day I added my broad-leaf Ludwigia. World of difference! The roots have attached and are growing out of the bottom of the driftwood.