I've eluded to this before,,maybe I did give some details,,,,,but here you go.
How would you like to reduce your synthetic nutrient use by 50%?
There is a product called SEA GREEN. This stuff is worth it's weight in gold...
I use it to replace B vits and Humic/Fulvic supplementation.
It's a Kelp based product that is concentrated (very).
They say to use 1-2ml per gallon of feed.....I found to use 1ml per feed.
You will quickly find that it will cause you to 1/2 your feedings or you'll burn.
I used a daily feed nutrient and had to skip to every other or even less. I now run synth grows at feed, water, water feed....The base nutrient is Hesi.
Now that can save $.
I must say,,,you will have to experiment to find what works for you.....This stuff increases nutrient up-take big time!!