I'm Maz, mum to two little ones, and have just set up our first fish tank. We have 2 baby Fantail Goldfish in a 28L tank. Quick question: is it possible that I've successfully cycled the tank in one week!? I stuck a huge piece of wood with plants attached from an established tank, and had the water tested at the pet shop this morning. Ammonia was zero, Nitrites were just above zero (between zero and the next box on the chart), and the Nitrates were high (but comfortably below the 50ppm limit). I will retest tomorrow to make sure, as one fish seems a little distressed (fins clamped but no other sign of illness). He started looking 'off' three days ago. He still feeds well though, he just looks a bit sorry for himself. His little tank buddy is absolutely fine. Any thoughts?