So the fhm I put in are doing fine. Two weeks ago I added 100 golden shinners to the mix. Within the two week period they have just about all floated. I called the place I got them from to see what happened. He said being the pond is small but deep (12ft in the middle ) there could have been a turnover from the massive rain we just got and choked them out. I don't have any aeration in there yet. He said the shinners require much more o2 then the fatheads and that would be the reason they lived. This sound right to you guys? Anything else that could have been the reason?