I use Happy Frog soil when I transplant into my five gallon fabric pots, I use Advanced Nutrients starting when I flip the light cycle then I use them with every watering until time to f
You can absolutely feed every watering in soil. I do, in the flower room anyway. For veg it isn't really necessary.
But in my garden, water + feed every day at lights on in the flower room.
Cool is it better to water+feed when lights on?