Hello Everything is basically fixable since Biobizz is an organic fertilizer and not a mineral one and it needs more time for the plant to absorb it, if you gave a lot of mineral fertilizers it would have already dried out and so everything seems to be fine, plus you are growing on a coconut substrate, where excess water is not retained. in principle, this is good, since excess fertilizer will go through the pot along with excess water.On average, they begin to feed coconut soil when the plant is 2 weeks old. But if you feel like you've overfed, you can simply give it a few waterings without fertilizer, and then apply it again a little at a time.Good luck👌