then i would suggest a test run test your ppm before adding the h202 , then again you add it and wait 20 min, then add your nutes and test again after about an hour before watering your plants with it. This isnt really an accurate way to tell if its working but its something to go on, i have not personally used H202 but from what i hear of you use small doses with your setup it may be ok , though for air , pumps and stones are better period. You can risk killing the micro organisms as well as chemically bleaching and killing your roots if you over do it , so its really something you may want to experiment with on a separate batch of plants before using it on your main harvest. Good luck!