My take-away from this thread is that just getting the CO2 dissolved into the water may not be enough; you need to help get the CO2 from the water to the plant.
To test this, I added a powerhead next to my internal CO2 reactor with it’s flow directed at a clump of pigmy chain swords that had not been growing well. I was amazed to see that not only did the chain swords quickly turn bright green and start sending out runners, but stands of Ludwigia, Rotala, and Java Fern on the opposite end of the tank (where the current went after deflecting off the front glass) also had a dramatic increase in growth rate. Pearling thru out the tank is increased. This increased growth is so dramatic that I am now having to start increasing NO2 and PO4 dosing to keep up ! After seeing this, I am now working on adding an XP3 with an external reactor to get some stuff out of the tank and provide a large increase in flow.
-jd
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