@JM great video on nitrogen ,
@Kis Here is for question for you guys on adding fish frames - skin - ect to the soil when building , Now when I build my soil which is anything from 200 to 400 liter at a time and I have been adding it for a while now with each build . The amounts I use is what I think is needed , at this stage I have found I don't need to add external input of [ N ] , I don't see fade till about week 7 on a 10 week grow [ Autos ] Amounts I use is by amount of soil , When I first started I could get to the end of week 4 . That is when I started to add more . All fish waste used comes from wild caught fish .
ps JM -- KIS [ P-K ] I use Seabird Guano - liquid Seaweed . any videos on those .