DD (10) has been desperate for fish for at least a year. I am quite happy with rabbits, guineas, hamsters - no experience of fish.
However, she saved up and bought an aquarium from Pets At Home - 14 litres. We filled it and put all the recommended treatments in the water. It also has a filter made for a much larger tank, since the one supplied with hers was very noisy. It took about three weeks to get the water to the standard required by PAH (ammonia, pH levels etc), then DD bought two little fish to go in it. The problem is, the water is quite smelly and seems too cloudy to me. I suspect she overfed them at first as we were getting used to how much they eat. We have replaced about a quarter of the water twice (making sure the new water has warmed up, and adding Tap safe). I have cleaned the insides of the tank with a special scrubber. The water is still too murky for my liking - although not horrendous.I'd like to start all over again, but not sure how the fish would cope. Any suggestions?