Ya fuck that seaweed shit. Its probably only high in one or two macros and low in one or two. All you need is the canna substra. Thats what i use! That stuff works great. The seaweed will just make whats going into the root zone unballanced on what you need for the npk anyway unless the seaweed is 1-1-1. And thats organic and your in coco which loves synthetic to the roots..
Funny thing is that i havent watered to runoff in two runs. Well i do a flush if i really think i need it but like a hand full of times during a grow and the plants couldnt be happier. If you run that substra vega and some calmag, at low enough ppms, you dont need runoff. Thats what nutrient companies and hydro shop owners will tell you to line their pockets though. I have one plant thats like seven feet right now and i havent gone over 700 ppm with it. Its fine. If anything it may be getting fed too much. I probably do need a flush soon but hey, its been going for almost five months with no runoff. Just had an auto come down after 100 days...never had runoff. Check my thread..
https://www.rollitup.org/t/cali-connection-grape-kush-search-for-the-purple.893517/ The auto that just came down looks great huh?
All im saying is that youll be fine with a small plant in a big pot if you can control the water amount put in. Two days between waterings is perfect. And control the feed. Low ppms so the plant can use it all instead of developing a salt buildup problem in the root zone.