hi, have you introduced anything to seed the bacteria? like a bit of media from an established filter, old tank water, or a product like bio spira or seachem's stability? it sounds like you have no bacteria to start with so there is no bacteria to even start the cycle... it has to come from somewhere. if that is the case, which I am guessing it is, I highly recommend seachem's stability, I use it to cycle all my new tanks and they are usually cycled in less than a month.