FA is ok in any pond , its helps with micro bugs the small fish eat. It's really early to worry about. When it's starts getting bad , if it does. You can't control your nuite. flow. Only and only on a small pond. Hydrated lime will kill it on the spot. Never use alot at one time , unless you monitor the PH. Do little spots at a time. Cool thing about HDL in stays put. You can stir the bank with a paddle latter if the FA statrs up.