My two cents bro, maybe I would have grouped the plants closer together, as there is no co2 they won't fill up the space in between very soon.
Yes, I would have loved to planted closer, but I was limited in the amount of stems I had. Thus, spaced stuff further apart and waiting on growth to fill in.
To answer that question.
Blyxa survives without co2 but doesn't grow at all. I've had the same patch for months.
I actually already have a significant amount of growth on my blyxa, quite surprising really. I am going to try doing weekly updates so I can keep track on how everything is doing.