Unfortunately I find myself joining after a fish rapture event occurring in a long established existing natural pond. I've been a long time fish enthusiast and successfully keep indoor freshwater aquariums. Our pond is just shy of a million gallons and has been doing it's thing for 37 years. This week we were admiring how healthy everything was, and only two days later we are scooping out dead fish.

Moving forward, I am looking to install an undergravel pvc grid filter kind of thing. There is no electric for this pond and I have no desire to add any. My idea is to add solar powered pumps and incorporate them into the system with some water features. I also have a runoff path that feeds the pond which I may landscape with rocks to create a cascading effect (still in early idea mode).

Any tips and adventures/misadventures are welome!