I copied this from the site
www.microbeorganics.com. This site has some very good information although its laid out as a single page which can be a little frustrating. Some may be familiar with it already. I'd also like to state that nothing is written in stone and there are a lot of ways to brew compost tea and apply it.
I had read that many growers and landscapers were adding some of these amendments into their ACT just before applying and I believe this process was endorsed by SFI. Anyway we decided to try saving some time and money and dumped 5 gallons of fish hydrolysate into a 1200 gallon batch to pump out. I had, as usual examined the finished brew microscopically and out of curiosity took another sample after mixing in the fish hydrolysate. To my astonishment and dismay I had wiped out or put to sleep almost half of the microorganisms. This was the last time we did this.
We always apply amendments separately from ACT and this is what I recommend unless using the most minuscule amounts. I surmise that adding anything to a finished brew can have similar negative results. The amount of FH we used was 0.4%. If you have a microscope, go ahead and experiment.
From my experience compost tea generally comes out well above 7 on the pH scale. Fish hydrolysate is very acidic would drop the pH the same way pH down would.
After reading this I've since stopped adding anything to my finished teas. With that said, I don't use a microscope and can't definitively say if that is true or not. But, I do have a tendency to follow what I consider salient advice from those who have taken the time to do this type of research.
I'm sure there are amendments you can add that won't disturb or inhibit but may also encourage the microbial populations.
Like many I'm always open to ways I can more effectively harness the forces of nature and use them to their fullest.