My plants seem to live, but thriving they are not. I'm in Arizona,
full sun (lot-a-sun) the water parameters are all 0 with the exception
of the ph 8.6 (might be the problem) we have hard water. The salt
content is .1% I use coral sand as the buffering agent and it keeps it
at about the same 8.6 that comes out of the tap. The koi and goldfish
are doing great since there's no fluctuation, but I think maybe it's
killing the plants.

The hyacinth sort of sits there and looks kinda melted. Duckweed and
Azolla survive but certainly don't more than a few inches of surface
area. The lilys do ok but don't bloom.

Is it the ph? A lack of nutrients? I have a couple of large filters so
no ammonia or nitirite. Salt? I tried potash and koi clay no luck
there either. Any ideas?

thanks