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I don't see anything of concern with the water parameters. As long as it remains stable, there isn't much we can do there. Don't do anything to the water until you see Nitrates at 5 or TDS at 160 (whichever comes first). That means no water changes. The only other advice I can give is to maybe increase protein in the food. Try frozen blood worms every other feed along with the regular Dennerle and BacterAE. Should be fairly simple to include in the feeding regime. This form of protein is severely lacking in shrimp food. Meaty protein is not the same as soy protein which is used a lot in shrimp food. If they go nuts for frozen bloodworms, you know that is something they are lacking in the diet.

I use CO2 in all my tanks to get it to around 35ppm. Plants in that tank are all grown by me from invitro. Fert I'm using is the nilocg shrimp specific one. 1. All the tanks are the same. pH is around 6.0 could be lower due to ADA soil. TDS 130, nitrate 0, nitrite 0, ammonia is the typical not really 0 but not anywhere near dark enough to be 0.25ppm. All tanks are unheated since they're all shrimp only tanks, and I live in California. 2. They get the Dennerle shrimp food and BactarAE. 3. I don't use Seiryu for that reason. I only use dragon stone in all my tanks.