bbkaldoanswered grow question a year ago I had the same problem with Biobizz and same strain. It is a Nitrogen toxicity, probably too high EC aswell. You shouldn't use Bloom yet, aswell, but it is generally your choice. Follow the EC.
Biobizz wrote to use ALLMIX dosages on LIGHTMIX soil on automatics. Do something about it before it is going to affect freshest leaves, yellow clawly parts would probably just crush and fall off with time.
Lower Bio-Grow or use only Bio-Grow. And EC+PH meter, you won't have to guess with this kind of stuff!