I set up my 20H Sun and did the 5 ppm ammonia, put a sponge from my Penguin powerhead from another tank in there and a new Penguin 200 powerfilter w/biowheel. Everything was fresh except that sponge. I tested my water tonite, 5 days later, and 0 nitrites and 20ppm nitrates, and there are no nitrates in my tap. Is it remotely possible that its cycled or a fluke. Anybody had a tank fishless cycle anywhere near that time period? Thanks.