Sorry to here about your fish
Like Koiman I put a couple of extra stones in last week but even then at the peak of the hot days i could see my fish were toiling so what I did as a temp measure was to use a length of 1.5 inch solvent pipe a 90 degree bend one end and a 45 degree bend other end and put this into one of my water returns on the pond wall and put it up like a periscope the water came crashing out back into the pond and supplied the extra Oxy they were looking for. I know it may sound a bit Heath Robinson but it certainley worked
Mik
