Does anyone have any experience with this? I have a 38 gallon tank that is in a fish-in cycle and I've had to do a water change every day. Swapped the carbon cartridge that came with the unit for the ammonia remover. 4 hours later I tested the tank and for the first time it tested at zero ammonia zero nitrites and minimal nitrates let's say under 10. I am just curious if I use this in my filter if these are typical results and if they are how will I know when the cycling is complete? Aqua Clear states that it has "cycle guard" technology that ensures it won't interfere with cycling but how will I know the tank has cycled? Thanks...