help mixing Roots Organics Trinity and Europonics Fossil Fuel

Hi i was curious as to whether Roots Organics Trinity and Europonics Fossil Fuel could be mixed? im working with Fox Farms Grow Big. I know i should have checked first but instead i went ahead and tried mixing Roots Organics Trinity with Europonics Fossil Fuel and fox farms grow big at about 1/4 strength each and seem to be having minor issues could be that the PH is too low but im not sure. i have it at 6-6.5 closer to six tho.. but i heard its better to have it closer to 6.5 because of the spectrum of nutrient uptake that happens then. im curious as to whether it might be that or the combination of Roots Organics Trinity and Europonics Fossil Fuel.. i did notice that they both have humic acid so yea not sure if thats the issue

On the shelves tho i do have Age Old Organics Grow and Age Old Organics Bloom, Fox Farms Grow Big and Fox Farm Big Bloom, Roots Organics Trinity, Europonics Fossil Fuel, House & Garden Drip Clean, and lastly Advanced Nutrients Bloom. Strange little list i know but if anyone here could help i would highly appreciate it thank you and have a wonderful sunday