Day sir . So the fish wouldn't be a replacement for ur guano. And I'm no expert. Im trying to head more in the Korean natural farming direction using fermented plant juice and extracts. The guano is something i as well want to get away from just because I can't make it . I'm going to supplement with rock phosphate and a fermented extract I made with a small cantelope , couple of bananas, and a cup of cooked chickpeas. Fermented in a dark glass container for a week by mixing with equal part by weight brown sugar. I also ad labs that I also make too all my fermented things. Then u take that juice and use it a like 1000/1. I've made poke,comfrey,aloe ,chicery. The sst is just sprouted corn I use organic popcorn because it's the easiest non gmo thing for me to easily get. Sprout ur corn till it's got .250 to .500 tails . Then blend up I add a little bit of humic acid and bubble for 10 mins. I use the sprouts between organism teas. Corn in veg,alfalfa and barley in flower. I also do alfalfa,Mung beans,radish and others. I'm getting most of this from this dude named Chris Trump he's got a YouTube channel. I'm using his recipes for most of the stuff I'm making. Sorry for the rambeling order I'm shitty at typing and such. Happy gardening