How long does it take for ammonia to build up? The reason i ask is that I used Bio-Spira when I set up my tank about a week ago and am still reading 0ppm on everything. Normally without the bio-spira would I have higher readings? Just want to make sure the bio-spira is working rather than having the levels spike all of a sudden. I'm going to do my first water change tomorrow also, probably 20 or 25%.
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