I won a goldfish at the carnival, and I want to keep him alive. I bought food, a 10 gallon tank with a filter, light, and heater. I was told to leave tap water out for 24 hours to let it reach room temperature, and right now the fish is in a small box. How would I prepare the tank? Can I just put the fish in? And in the small box, I noticed white clumps, and some kind of stringy thing that looks like a rubber band. What is this?