what is wrong with my tank if the water gets a green cloudy color to it. i thought maybe it was underfiltration so i went out and got an aquaclear 300 and the original whisper power filter 30 is on it. the filtration is filtering 445gph so i should have no water quality problems. inhabitants of the tank are 7 african cichlids and a polypterus senegalus. its a 29 gallon.