yes it is hot here also, so hot you cannot sleep my bedroom windows face east so i get the sun as soon as it pops up over the mountains at about 5 o clock ! it is 72f in the garden now and it isnt 9 o clock yet, expecting it to reach 82f + by mid day, anyways all the other fish are fine, and the lily is ok, i think what happened was down to birds as they like to bath in the filter early morning and they stand on the pipe while they shake the water of their feathers and it has maybe just worked loose and fell out, will secure it better, the pump must have been pumping away just air for a while, but once i got the water level back up again the pump worked fine no problems ! yes that cut of switch is something worth looking into sissy thanks,