Jeff,

Two points:

I don't totally agree with your finding fault with the diffuser system. In my small pond I run it 24/7 but shut it off when air temps rise to 80 degrees. However, I also run enough 51.6 F. aerated well water in to keep temps down in this small pond from some time in May to September 24/7. If you have a smaller pond like me (1/12 acre 88 by 59 feet)with a few hundred pounds of trout the diffuser is important to help break down wastes etc. I am considering getting an aerator similar to yours to run at night in the summer as I keep upping the pounds of trout I raise. If your pond was small enough to keep cool with the aerated well water than you would be fine.

As far as the female being stressed by reabsorbing the eggs that does happen. They are not finding the right substrate and flow to cause them to build a redd and free the eggs. Therefore they reabsorb the which is stressful. That's all their is to that. I only buy male fish for my pond mainly because that is what my customers as most want them in their full spawning colors and kypes.

If pigs could fly bacon would be harder to come by and there would be a lot of damaged trees.