I have a 10 gallon that i have been setting up and my ant knew it. She knew i wanted a red tail shark so when she was at petco she saw some and got me 1. Now i have a red tail shark and a uncycled 10 gallon. So my only choice was to put it in it. It was close to cycling but it was not done. I have always cycled my tanks before putting fish in so cycling with a fish is new to me. So i need advice. About what level of ammonia readings is deadly to fish (example: 0.25). Also HN1 had a article he referred to for cycling with fish. Any one have that link? Now i have to hurry up and get my 75g set up.