You're right burger, HSB do like hard water. Sounds like it truly is the 1 in 200,000. If trout could reproduce, they bury their eggs in gravel then I see no reason why HSB could lay their eggs in the same area and have them get wedged in between rock crevices and survive. With no LMB or other gluttonous predators in the pond, some of the little ones survived. Eric, any research on the quality of a F2 HSB?