This is one of the main supplements that gets used in aquaponics. Seaweed extract. It contains potassium and trace elements that are safe for fish and can help get a new system up to speed on the things that are not going to be provided by simply fishlessly cycling a system with pure ammonia.
The seaweed extract doesn’t provide enough nitrogen to risk overloading the bio-filter which is why it is generally quite fish safe.
It doesn’t take a whole lot, a cap full or splash per growbed (depending on the size of grow bed) is about all that is needed per dose and dosing might be once a week or once a month and less often once a system is well established unless plants show signs of needing more potassium or trace elements.
One Quart or 32 oz size $12.35
Sorry, I’m no longer carrying the Liquid Seaweed. I do have a powdered product that is listed for Organic production. 8 oz bag for $12.35 (which will make more like 8 gallons of liquid) and can ship for less. Please contact me if you would like to purchase. I can send you a paypal invoice. Sorry my web site needs a major overhaul and I’ve not had time to deal with it yet.