That's some great looking ludwigia!! And the set up sounds like it has ample lighting. There ought to be no algae problem with all those stem plants.
Cannot imagine really having a lay out with 1 tall stem plant, and no hard scape. It just doesn't work.
If you are planning to make this a "display" tank, then I hope you have some plans for a lot of that ludwigia. Some how trading/selling a lot of it, especially once the algae is blasted away. A planted display probably won't emerge from so much usage of a single red stem plant. Red plants are usually "high lights," not the "body." A lay out's foundation comes from the hard scape, substrate positioning, and from the positioning and dense growth of the smaller plants. Especially the plants in the mid ground and those tied to the hardscape. These generally create the "structure" of the aquascape. Otherwise, we just have a row of flowers.
