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If you aerate, don't use a bottom diffusion system, use a surface agitator. A bottom diffusion system will de-stratify the water, mixing the warm upper water with the lower, cooler water and raise the overall temp of the pond, even with just aerating at night.

Been there, done that with the bottom diffusion system and had the trout die much sooner due to increased water temp than with no aeration.

A client had Golden Rainbow Trout survive into almost 80�F water temps by having both a bottom and a surface agitation system going 24/7. Oxygen levels were at the saturation point.