I am fishless cycling a 55 gallon (unplanted) tank using Ace Hardware ammonia. Two days ago I added one of the seeded sponge filters from angelsplus.com. (No affiliation, but I am impressed.) I am using the API Master Test Kit. The last two days I have 0 ammonia and 0 nitrites (with 80+ nitrates) after 24 hours. I have been adding ammonia daily to bring tank ammonia up to 3 ppm. I have easily read at least a dozen different fishless cycling "how to" articles on the web, most on various fish forums (though this is the one I've chosen to join). I've read most of the posts in this section on fishless with ammonia, as well as some in the archived posts here. In the various articles and posts, I see prescribed ammonia amounts of 3 and 4 and 5 ppm as tank level once added, depending on which I read (even just on fishlore), and processed to nitrate in sometimes 12 and other times 24 hours, stated as the goal. I do not intend to fully stock when I do add fish. I plan a peaceful community tank and intend to start with about six zebra danios. Would anyone care to advance an opinion or better as to how much ammonia ppm ought be achieved for daily processing, and/or whether it is 12 or 24 hours that it should take to process to nitrates? I'd be grateful, as I think I'm at least getting close to cycled.