It'f fine as long as you aren't running anything live in the res, beneficial microbes or fungi. The strength could fuck it up, but if you stick to 3 percent at walgreens a bottle a 5 gallon bucket should work (pint). If you're gonna use 29-32 percent dilution is important. I like to run a stronger solution of h2o2 myself but theres a fine line between a beneficial amount and a dangerous amount.premix and dilute if you get the 29 percent and also be careful, that stuff will take your skin right off.