im trying hair for the first time... and yes ive used fish outdoors..i dunno if this would help and i sure as shit wouldnt try it in an indoor grow but i know a few guys that grow roses and they swear by dead fish, no kidding btw, they'll go fishing catch a pike or trout and bury the fucker in the soil next to their flowers. personally i'll stick to 70%miracle grow, 25% perlite ,5% vermiculite and dont compact it too much, i dont need to give any nute for the first 4 weeks or so and my yeild is always decent.