And in extra fertilization?

yeah, it might be, better reduce a lil bit on the alga grow, you now know the alga grow has a higher K ratio than N and can cause a lockout in other micronutrients too, wich can in turn cause major problems, i think you caught it in time, so just reduce the dosage and alternate feedings with waterings, dont just feed, and if you are already feeding with intervals just increase the interval by 1 watering more inbetween feedings. Remember, reduce dosage, increase interval, and let her recover. She should be able to get over it, but i recomend you find a grow nutrient with a higher N ratio so you can specifically feed higher doses of just the nitrogen without creating an imbalance overall. Good luck, im rooting for you and will be checking on the progress. Stay lit growmie.