Of course you can see that the plants are in soil.
Anyhow, I use 2 tablespoons to the gallon. And at this time I can feed each of the plants 2 quarts of liquid at each watering. I water every 2-3 days.
And like I said, I'm using two gallons (2 quarts each for eight plants = 2 gallons).
The plants will probably not get much "thirstier" from this point on, maybe three gallons every other day.
I have a cycle of three. Nute - Molasses/Water -Plain Water.
I'm using a technofloura nute program.

Thanks for asking.

Sho