I have done a water change on friday I drained it and added the declorinator and m icroblift ph and rinsed everything off before putting the pond back together again. I also treated it with broad spectrum and did the 25% water change twice. This morning they seemed fine but I also thought that before and then I lost a couple more. So I have to see when I get home. I'm keeping my fingers crossed. Do you know if another fountain would help?? More circulation? ? Thanks for the suggestions