Hojas marrones

Biobizz nutrients 4ml/l Top Max 4ml/l Bio Bloom 3ml/l Bio Heaven 3ml/l Acti Vera 400 ml in a 7 L pot every 2 days (dry soil) I was thinking if I was giving it too little water because it starts to look dry by the day. pH for the last 2 weeks 6.5-6.6 EC for the last 2 weeks from 1900 to now 1500 in the last 2 waterings since I'm going to start with 2 weeks of root washing Temperature for the last 2 weeks: Lights on: 27.5 max 25.3 min Lights off: 20.3 max 17.2 min Humidity for the last 2 weeks: Lights on 37% min 40% normally 44-45% max Lights off 56% max Thanks for the quick response.