I would pay attention to the water sprite before I did anything. I used to grow it in my tank and it was literally a weed. It grew out of control with minimal ferts and no co2 injection. If it grows pretty well for you, I would probably use that as an indicator of what you might be able to do with your current setup.
I am not very optimistic with the hair grass either, but time will tell. Based on the information that I have read regarding the wpg rule, it doesn't nessecarily apply to small tanks such as this. If I were running this setup, I would just keep it simple for now and go with what you have and see how it does before adding more plants/fish. Keep us informed because I would like to know how things progress.
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