Dry yellow and brown leaves

Wish you had a diary but just on the pic. I agree with both answers below. Looks like your ph is off, and your ppfd is high and pushing the plants hard. I would recommend dialing the light down to 500 for the week and water in at known consistent ph. This can also be the result of municipal(tap) water when they change reservoir source or recently treated the water. Good luck Ivan ☘️

You underwater plants from photos. Have inproper food or ph to uptake food. I see lack of magnesium, phosphorus, nitrogen, but when no diary , noone will help you. There is no magic in diagnosing, there is knowledge, but you dont provide base points even. People are insane, almost every grower speaks about dli, ppfd and other shit, but dont care about simple basics as watering schedule and ph ..... Rethink priorities...