I'v seen that Peroxide speeds it up some, but i wouldnt reccomed it, because i dont know what it would do to your fish. I have used it and it didnt effect my tank any. It is supposed to be like putting in liquid oxygen and it makes the good bacterica move quicker. I used Hagen Cycle, which i think works pretty well after it is well in there. Once you put it in weekly for about 4 weeks your tank is on cruise control. After putting it in for 14 months i stopped for 2 months and my nitrates and ammonia ect stayed zero. I have a cascade filter and i dont use the bio filter in there, because it gets slimy easy. It was leaking after like a year, so i got a new one and my tank is still fine. I did get ick last year, but that is beause i dont have a heater.