Red, red wine. That's probably correct, and killing his plants.
Mine have looked like this when my roots were too cold. But I imagine red wine is terrible for the plant.
Means it hasn't been cured yet. Harshness goes away with properly cured bud.
If you were right, why don't our vegetables taste like a cornucopia of animal excretions?
Alright, 3-4 liters will be enough to fully saturate all of your medium. You want to avoid dry pockets because roots won't grow into parched soil. Sorry about the delays, I'm like 12 hours behind your time zone.
Just make sure all of of your medium is evenly saturated each watering. Do not spot water. That's asking for trouble.
For a 3 gallon pot, you need 3 to 4 liters to properly water.
5 gallon pot about 1.25 to 1.5 gallons of water.
I know I can come off as an ass, just wanted to make it known not...
Are you watering fully? If not, you've severely stunted any root development. And no offense, your plant is showing signs of root die off and if you don't fix it, you're just wasting your time.