In a pond of 9 years the fish started dieing with no good reason. These are all feeders that I used to establish the pond, the water is aerated with a 2400 GPH pump, the reading show Good or acceptable values for Nitrate, Nitrite,Hardness,Alkalinity and PH. I just got the Ammonia test kit today and will test with that. This all seemed to be in coincidence with the new food supply from Wardley- Pond Ten, but have stopped feeding this and the fish continue to die. Three today and 7 yesterday. The strange part is that most of them are the smaller 1 year old ones. The fin condition is very good in there are tails up to 3 inches long- no spots. I have been told by a local pond builder to empty the pond and scrub it down and refill it and it seems that this is the only way that I could remove the sludge that may be the cause of this so this Sat may be a fun day- any help to fix this besides is welcome.