Continual-flow style water exchange will not keep your water 100% pure and 100% oxygenated. (Well, not at a 1-exchange-per-day rate it won't). It will just make it better than it was otherwise. So it may *or may not* be adequate to your purposes.
Trying a lower stocking density would be a wise...
Can I make an important practical suggestion here, as a sometime recreational aquarist and PhD aquatic biologist (although, while I have worked around aquaculture people, I am definitely not one myself):
LOSE THE PLANTS from your plan. Seriously, seriously, seriously. Two big reasons:
First...