i was just wondering is the black water extract useful for gf spawning ?as i have been doing some research and apparently it is supposed to help with it but of course i dunno nething about these things

I wouldnt have thought so.
Its used to aid the spawning of fish from rivers like the amazon as it has extracts and also lowers the ph i believe so no use for goldies.
I believe to replicate in the tank for tropicals you can use oak leaves much to the same effect.

yeah i thought as much i dont know why they put on product directions on the site to use double strength for hardwater fish such as goldfish weird