AsNoriuanswered grow question 14d ago You are overwatering and watering wrong at same time ;)
Leaves never touch soil, give support, lay on pot verge and so on, that way you won't have those necrosis and will create better air circulation under canopy.
Overwatering - aka watering while soil still moist , can bring pH fluctuations.
When plant leaves reaches verge of pot, you water all pot. Divide amount into 4-5 parts, water them with 3-5 mins interval. Colect run off, never let it to be reabsorbed. You need 10-20% of total watering amount to come off like run off. No dry pockets, water slowly !
Lift pots to understand when to water, you'll feel heaviness, humans have good muscle memory :) heavy - wait, easy to lift - water.