Purple punch auto

Hey, so I’m a first-time grower and if I have to be honest I thought this would be a lot easier 😂. Turns out it’s quite the opposite I’ve been having some issues on and off throughout the whole growth and this is the issue I currently have seen in a few photos I thought at first it was not enough nitrogen and magnesium but then I noticed the tips burnt on the leaves and I’m assuming it’s nutrient burn but the plant is still yellowing and some leaves are coming out horribly and I honestly have no ideas on what to do the nutrients list I have is on the post I use half of the recommended dosage by bio bizz as they are auto flowers and I don’t want to overdo it and kill the plants are potted in bio biz all mix and worm hummus mix would anyone be able to give me any information on what can I do the bio bizz mix chart is available online also drop me a message and I’ll be able to Foward it to you