miracle gro plant food + liquid seaweed?

hey there, i'm growing my first cannabis crop right now of 9 plants, still in an 18/6 cycle. i had been using liquid seaweed once a week for them, since that's what i used on all my other regular house plants.
however, i started to notice what seemed to be a nitrogen deficiency in the plants, and just repotted and started giving them miracle gro plant food, to which they've responded well.
i'm about to start my plants in a 12/12 cycle, and am wondering if i should keep using both the liquid seaweed and MG plant food? any thoughts/advice on how much/how often would be super helpful! btw, this is a low, low-budget operation that i'm just doing for the hell of it/and i'm in a new town and have no weed sources :3

just make sure whatever food you use from here on is intended for blooming and use less than what the bottle says. check the NPK values.