Sorting the pond out meant pulling the pump out & back several times. In doing so I must have damaged a seal? The first I realised was when I put my hand in the water and got a good belt. Tried the opposite end (10 feet away) and yep, got a lesser belt. I expected the fish to be floating but they seem oblivious. I know nothing about electrics but wonder if its because I was earthed whereas they are suspended in the water.