Quote Originally Posted by Loafyboy
Thats right, it will help prevent stagnation of the nutrient solution (unwanted bacteria). Although, algae shouldn't be a problem if your reservior is light proof and absolutely no light gets in because algae needs light to grow, just light your plants. Even a very small amount of light leaking into the res can allow algae to form.

Thanks Loafyboy,

You've been a great help. Now I know adding an air pump and air stone is very necessary or without using an air pump and stone as long as I keep my reservoir light proof.

Thanks for patiently answering my questions. :thumbsup: