I turned the second chamber (from the left) into a mini fuge by using a submersible Egg Lite and a bunch of chaeto. Do you think I should add an air pump with an airstone in the compartment to get some increased water flow through the chaeto? I was told the more flow, the more nitrates the chaeto will remove. I know that bubbles in the aquarium itself are very bad....do you think the pump in the 4th chamber would end up pumping the bubbles from chamber #2 into the tank? Any info would be GREATLY appreciated.