Thank you both for the info. Sorry for the delay, I never got notified of the replies. The only thing I plan on raising in my pond are goldfish and possibly a couple of frogs.

@ ewest, my pond is EPDM liner, moss rock, which I am assuming is sandstone, various sizes of river rock, and RipRap, which I confirmed today was granite. Other than that, not sure what else could be doing this.

@ Cole B., When I get back from vacation, I will try checking my pH at various points within the day and report back.

By the way, I read somewhere about over oxygenating the pond can cause problems. Can this be true? I run my aerator 24/7.

Thanks again,

Mike

Last edited by Parallon; 07/02/19 09:53 PM.