So I get home from work today and stroll on down to the pond and bout started crying. So far iv pulled 10 floaters. When I got home I did the add some of my water to the cooler and let it set. Which had a really good airatior going for them. I waiting prolly 20 minutes or so an added some more water for bout 10 minutes. When I let them go.had one HSB tht sunk n flipped over. I got him up n going and swam off (bout 630). Before bed (10 or so) took spot light down and didnt see any floating. So my question is what did I do wrong? I think in the 11 years iv had the pond Iv only found 2 to 3 ead fish. I know these where healthy when I got them. Only in the cooler for maybe an hour n 15 minutes.