A $2 air pump does 200 "liters" "aquarium", is irrelevant, soooo please, talk "quantitively" and not like an epic noobie.
Are you saying "200 liters" of "aquarium" water "per" what? "Per" every "sec", "min", "hour", "day", "week" or "month"?
Also how much "dissolved oxygen" (PPM or mg/L) can a...