Disclaimer: Ken is certifiably nuts. And, at darn near 70 YOA, I am senile with ADHD and dementia. Just ask my Wife.
Yeah, and we're the moderators! Sure makes one think about "One Flew Over the Cuckoos Nest."
Anyway, at about 15 lbs. of fertilizer, I don't believe that was excessive, and as EWEST said, it would be long gone by now.
I agree with Dave D., that nutrients/minerals are coming in from one of your water sources, and that your fish populations are out of balance. I'm just not sure it is all bad. It sounds like your pond is extremely productive due to the water fertility.
Can you feed too much? Yes. Are you feeding too much? Maybe. As Dave said, that may be where the fertility is coming from. It may just be way too many fish.
Aeration may help -- actually, probably would help. But, I think a serious culling and re-balancing plan would be one of the first places I'd start.
Ken
