Looks to me like additive overdose and your ingoing water ph is too low.

I'd check for what the Ocean Forest provides nutrient-wise, and check the ingredients on your nutrients and additives, and see if there is some double-dosing happening. Back-off from any redundancies. (unnecessary repeating)
This is one of the main reasons I think that keeping it simple is the best way to grow. The more additives you give to a pre-fertilized medium, the more it will take to determine what's causing your problems.

For peat-based mediums ingoing ph should be between 6.3 and 6.8ish, or you risk nutrient lockout. "around 6 - 6.5" is a big spread, and you should pay close attention to your ph till you get to know your garden. Letting your ph jump around is a good way to stress the nanners out of her. (not a good thing)

If you are starting with a water ph of 6.0 and then you add your nutrients, the ph dives even lower. Try getting the water ph to 6.8 to 7.0 before adding the nutrients.