FWIW, I just did an experiment in my current grow. I have always used Happy Frog for the full grow for years but tried Ocean Forest this run and am very happy. I would not recommend as others mentioned starting seedlings in Ocean Forest. Did that my first grow and had seedlings like yours.
This time I started seeds in Happy Frog in solo cups then transplanted to #5's with Ocean Forest and holy crap, what a wonderful difference. 5 weeks and still didn't need nutes but I did start them 75% going into flower and no burn at all. Next feeding will be 100%.