I agree with not using any seaweed, kelp, or other additives. I was gifted a "recipe for success" kit which included all kinds if additives ... I started using all of them, had great success with the "live" Rez with my cool temps but wouldn't recommend it to just anyone. I'm on flood and drain and its not that big of a deal but really makes cleaning and even keeping the system clean very hard.
Algae and other shit grows easier with these kinds of additives so just understand what your dealing with before just jumping into it.
I nute my seedlings, clones , plants in all stages of growth. By a month in veg they are getting a full 1300 ppm wash in the e&f... Other systems can vary but I get excellent results by always giving them food. Even if its in low doses. The difference between growth and explosive hydro growth is what's in the "chow" after having proper lighting, ventilation and proper watering times for the medium your using. Starving plants for a month on 1/4 strength nutes would never work for what I try and do. But each system and setup is different , diff strains and diff goals for the grower.
Green mojo!!!