Thank you for your valuable comments and questions.
As for the amount of CO2, I use two methods, a drop checker (from Ista) and the KH/PH table.
With those two, I'm a little above the recommended based on other comments to help fight the algae
I used to run my lights about 8hrs, for about 6 months until I introduced a plant that had the algae and hell broke loose.
Through the fixing time, I reduced time to 4hrs and started EI and raised the lights
Now I run the lights about 5:30 hrs, and brought the lights down again just last week.
My light fixture is a Finnex FugeRay Planted+, I've had it pretty much since the beginning (so, about 2yrs)
As for the Ludwigia, I just remember that it look very red when I first got it at the Aquatics Store.
Almost like this:
As for growth, the Ludwigia and the myriophyllum grow the fastest.
And just to reiterate, the bottom leaves start rotting soon and algae attaches to it, so I end up cutting and re-planting, so I cannot get bushy plants. (Stems)
I also notice roots growing in the middle of the plants, which lead me to believe that the plants roots are not getting to the root tabs and thus need to grow me to get nutrients from the water column.
If it is of any help, here are the dimensions of my tank (quite small)
Mr. Aqua 7.5 Gal bow front
I dose in alternate fashion (seachem liquid fertilizers)
* PO4, K, and N after water change
And I dose 0.4ppm of FE almost daily.
Last note, as for the clay, I got Red clay and made tiny balls and let them dry, then added them as root tabs.