first of all, I will have my new tank up and running as soon as I have a filter and get some more stones to finish covering the bottem. First question, I at the moment have two comets. what are some other fast swimming goldfish that would go well with comets? Second question, when changing the water in the tank I know to leave the new water overnight first so that its the same question as the tank water, do I put the water conditioner and cycle in the new water and leave it sit or just add it to the tank?