I did everything the same, wiping it out with just warm water and a scrubbie, put new water in with the pump running, and then added chemicals.I let the pump cycle the water for a little while and then put the fish back in. Then the fish just staryed dropping like flies. after they were all dead, I completely cleaned everything out again, and reset it up. Bought a quick test kit and it tells me that the alkaline is just above ideal, and the ph is between acceptable and high. After I let it run almost a full day, we tried just some feeder fish. They are now all dead. I am besides myself. Had this pond for quite a few years now, and this is the first problems i've had.