I have not used Neptune, But I have used Multibloom and I was happy with the results. I am not affiliated with multibloom and do not profit from it recommendations.
But here is the link

Here is a link that might be useful: multibloom

I`ve used Neptune Harvest Fish fertilizer for three years with good results. One to two TBL spoon per gal. of water every 2 wks. Start 3 wks after plant out or 2wks after seeds planted outside are up, Peas and beans don`t need it.
Good gardening Bill

I have used it also with execellent results.

Ron
The Garden Guy
http://www.TheGardenGuy.org

Any fertilizer might be needed in an organic garden that is not yet in the good, healthy state. What is available around here is Alaska Fish Fertilizer and while I did use if many years ago I do not find it necessary to do so today.

Hi brandond...I have used NH for many years on everything. I apply it through an inline dispenser that is part of my yard/gardens watering setup. I buy it by the five gallon pail...and get a free tee-shirt also...:-) I think you will be pleased with the results of a twice monthly application. I use the fish/seaweed blend. Franklin

The gurus I talk to like Neptune because it is fish hydrolysate and not fish emulsion. The hydrolysate product is the fish remnants left over from processing that have been predigested with enzymes. The emulsion product, on the other hand, is the same remains treated with lye. If you remember your great grandmother's soap recipe, they took left over animal parts and treated them with lye. The soap is good (in fact the same process makes 99.99% of today's bar soap), but it's not well known for being a great plant food. So for whatever reasons, the gurus like NH. That's how I understand it.