Particularly, those will shallow and smaller ponds, are you monitoring your water temps? I'm curious as to what your average temp is during this heat. It's been in the mid to upper 90's here, but with daily breaks for clouds, and some rain, but for 2 days now there hasn't been either, and my pond was 90° today, and it's usually about 80-85°. This is starting to concern me, because there is a pleco in there....
I might have to move an umbrella over to the front of it, to block the afternoon sun from hitting it if this keeps up.