Fish emulsion is a soft liquid fertilizer, with Also hormones and other ingredients wich helps the plant growing well. Adventage is that it can be taken immediatly and because it is liquid it is better controllable. You can also spray it on the leaves. Use it besides your normal fertilizer, eg once a week, or more often in a weaker mixture. Within a few times you can see results..
About the pads, I havent tested it decent yet, but Yannick knows what he’s doing. Björn bjornholm had a podcast Recently with Yannick about this product, and other stuff..