A month isn't that long when it comes to cycling a tank really, Delvis. I mean, some people can find that they are at the right stage to add fish after only a few weeks, but it can take longer. As BigBruiserAl said, test strips are far from ideal; I do actually use them for ammonia, though I also have a proper ammonia test as well as a reading meter which sits in the tank water. I would buy a water test kit; these can be had for not much money (£25+ ish), and although I've recently learnt that the some of the commonly seen kits sold in stores can be mediocre at best, they are at least a starting point. Try to get a kit that tests for ammonia (obviously), nitrite, nitrate, pH, GH & KH. I've been informed that 'salifert' is a good make, & a well known expert in the industry, Bob Fenner, concurs with this (surprisingly enough, one of the chaps at my local store hadn't even heard of them!).
Another thing you could do is to pop along to a local fish store, and assuming they are reasonably experienced (in other words not clueless), follow the advice they give to get you started with the cycle again (be it adding ammonia or fish food). Kudos to you for not jumping straight into the deep end (no pun intended
), and chucking in fish when conditions aren't suitable. Patience can be very useful and is indeed applicable when starting a tank up. 
Another thing you could do is to pop along to a local fish store, and assuming they are reasonably experienced (in other words not clueless), follow the advice they give to get you started with the cycle again (be it adding ammonia or fish food). Kudos to you for not jumping straight into the deep end (no pun intended


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