did I genocide the beneficial bacteria?

Fungus gnats were really annoying me, and I nuked them with H202. Which I now realise would have also killed the beneficial bacteria. Would they have recolonised the soil? or did I kill them off?

I had a really poor yield. Im wondering if this could explain it.

not entirely certain that beneficial bacteria is a racial, ethnic, religious or national group. But yes, you probably killed them all.

Poor yield comes from inadequate light, poor growing conditions, bad nutrients or too little/too much water.

Rather than guess at why your yield suffered, use deductive logic; rule out everything it surely WASN'T, in order to get a shortlist of suspects.

Your answers will become clear at that point.

This is exactly what I do, run after run after run- but why bother if I'm getting good results? Because that's where the feedback is- and that's what makes me better.

fungus gnats annoying you? I'm sure they were annoying your ladies too. Meaning that you might have had rotten roots, which would explain the poor yield. I always water in good beneficials if the ladies are got stressed in any way, also at transplant is a good time to sprinkle the roots. I'm a big fan of bubbled up tea with beneficials.

Initial inoculation of starter soil with a little Neem, Crab shell, and BTI dunks. Beneficial predatory Nematodes I use also. While the soil is "cooking" the microbes seek and destroy. By the time I use the soil it's clean as a whistle.