Piggy backing on my last post, I had a really bad algae problem because I left my light on too long, oops! I did about a 90% water change I scrubbed all the algae out and began an excel dosing regimen. I started cycling my tank about a week ago. Last night before I cleaned my tank my readings were: ammonia: 2.0ppm, nitrite off the chart, and nitrAte 5.0 ppm. After changing my water the reading are ammonia .50ppm, nitrITe .25ppm, and nitrAte 0 pmm. I know the water change threw a dent in my cycle. Right now I have a piece of raw tilapia in a zip lock bag with holes in it floating in my tank. Why did the levels drop so drastically? What does this mean for my cycle?