blyxa is a plant that doesn't react well to being replanted. it will lose alot of its leaves and look dead, but just leave it alone. it will grow back
I had some growing where I didn't even know I had some still. It was under some crypts but still growing. getting them rooted solidly is the key.
I agree with the co2 issue. GET IT! you will regret it soon enough once you have to start dealing with bba. The tank looks great though, nice scape