I add about 50ml of 50% to my res about weekly when I top up, which is I think a 160 litre tub.
I use a one part nute called Extra Nutrex (grow and bloom), normally I have been using Grow for three weeks after clone transplant then the Bloom for the rest of the time and never use anything else except the peroxide.
Growing in hydroton, flood and drain, 4 per square foot @~50w per square foot CXB3590 COBs flower straight from clone or seed.
This last run got 29.5 ounces dry with heaps of stuff ups.