Sorry but I'll bring more questions here ! The 6.8 ph is the value of the fish tank , so the fishs are happy with that value but the hydroponics method are recommending a sweet spot around 5.8 so I'm surprised to see that you have no deficiencies and no excess after 9 weeks with a 1 point higher ph : do you know why aquaponics is allowing a higher ph without any issue ? is there a symbiosis with some elements of the water and the roots system that is helping for that ?
So you have 3 fishs and a 1.38 Ec so approx 0.46 Ec per fish , is the number of fish a value to consider if you want to play with the EC ? Is my calculation good ? I mean , will the EC raise like en EC per fish or is it a value due to the size of your tank ? for exemple if your fish tank was twice bigger , would your Ec be twice lower ?
How does it works during thje flowering process ? The plants needs should be higher during the flowering process so the tank Ec should be lower due to the plants consumption : will it be harmfull for the fishs ? Does the fish needs a certain Ec level , I mean a min Ec and a max one aka a EC range to respect for the fishs health ?
I'm curious to see the flowering , most of the aquaponics attempt I've seen were turning short after a month , yours is twice longer so I feel like you're on the way for a good stuff.