HI all. I inherited two goldfish quite some time ago. One died and the other has been living alone in a 2 1/2 gallon aquarium with gravel and a fake plant. After feeling guilty for quite a while I, with the help of an experienced fish friend, set up a 10 gallon aquarium 2 days ago. I purchased 2 sunburst platys to keep my goldfish company. Now (after the fact) that I have read about the nitrogen cycle and cycling a new tank, I am really worried that my fish will not fare well and I want to be ready to fix any problems. Does anyone have experience with this? I am so sorry that I did not prepare the way I should have. Right now, all seems well. Two are eating fine (flake food), one not so much. Should I be immediately buying test kits and adjusting or just hope for the best at this point? Any help is appreciated.