1st budget viparspectra LED grow

Most possibly nute lockout rather than burn, they need just time and managed water PH.

Yes, you can feed quite heavily with bio bizz. It's designed to feed the soil more than the plant, and doesn't need watering for run off either

Well, other than calcium and related phosphorus, it might be slight potassium issue.

It can be phosphorus, potassium, nitrogen, molybdenum, etc. Imbalance or genetic bias. It's more likely to be phosphorus related if not genetic, but it's always more than one factor, just some factors more dominant. If the reddening plant isn't the banana blaze, I recommend you use a bit more calcium than in calmag, perhaps citric acid, a bit of trace mineral stuff, potassium, carbs. I also notice the "yellowing" is at he tops, so it might be light related too, coz it doesn't really look like nitrogen itself. Unfortunately it's difficult for me to say, because I don't know your (or those plants) or the nutrient and soil balance. So I'm basically just speculating.

Just adds a hint of what ever flush you use, it won't change it drastically. Cheers