Not all ponds have FA. Turbidity is turbidity no matter the source. Many pond mgt books suggest to create an early season heavy plankton bloom to stop FA and use up nutrients. Thus no FA. In that case 2 of the required ingredients are missing nutrients and light. Again , as pointed out in the archives, FA needs light , nutrients and temps (which do vary by FA species)to grow. If you remove any one of the required ingredients you will not have FA. Light is the easiest to control.