Consider that all the oxygen needed for fish and plants is supplied by your air tank. Consider each fish consumes 48 grams of oxygen/day and you have 18 such beautiful fish in tank containing 30 gallon water. The water temperature is 22 C. (remember that the solubility of oxygen in water depends on temp). I strongly recommend you to maintain atleast 6 ppm of oxygen in the tank for the fishes to be playful and happy. Consider the tank is homogeneous and at 1 atm pressure.
(a) What flow rate of air pump will be most suitable?
(b) How long you can turn off the pump to do something?
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