I just used a properly prepared aerated tea for the first time last night and WOW, okay now I see why people do this! They increased biomass like 10% in 12 hours. It was crazy. I'm definitely a fan of this technique now.
I used earthworm castings, kelp extract, Bio Bizz fish, Vegamatrix Boost (basically organic Cal-Mag), fulvic acid, and molasses. Bubbled it for about 24 hours with an aquarium heater keeping it 75°F. When I walked back into the garage about three hours after starting it, I was afraid it had gone anaerobic for a minute because I was hit by a big ammonia-like fish stink. But that was just the fish getting it on with the molasses and the air bubbles. The tea itself smelled good, like the castings.
Even though I started out this grow convinced I wanted to abstain from using any guanos in it, a buddy has me nearly convinced to use some High-P fruit bat guano in these teas a couple of times once I get into flowering, and after the growth surge I just witnessed, I'm not inclined to resist his advice.