Could it be that the substrate is too compact? I thought that Flourite didn't compact as much as other substrate.
Lighting wise, I think I got a lot of light. It's 42 LED (low power) plus I use a desktop lamp at 23 watts. I get constantly small leaf size on all plants, every single type of plant I introduce. I'm confused on what I'm missing. Co2 pumps at a 2bps rate in a 6 gallon, I can't be low in that can I?
Now everything is going down hill, I even replanted but it doesn't spread, it stays low with small leafs. The yellowing is a bit of the iPhone 4's camera. It saturates all the colours.
*thumbs up for your tank, everything looks so healthy.