I'm buying a tank of tropical fish, but need a little help. Would you help me?

Well, I'm buying my first tropical fish tank. Let me list the items I am doing and where they are. $ 15.00-Water Heater (Walmart) $ 9.00-five of Neon Tetras (Pet Smart)-Top $ 73.00 Weekend Starter Aquarium Kit 15 Gallon (Pet Smart) $ 3.00 Silver Molly (Pet Smart) around $ 20.00 on decorations. (Pet Smart) I set the heater at least 78 degrees. It is automatic, however. Many people rated high and said heater that keeps your tank at a constant 78-75 degrees. I am also thinking about getting the special food for tropical fish flakes pet smart is about $ 7.00. I'm buying the tank and things first, and soak in water, because my teacher said heater and decorations. has to adapt to the first water. Maybe he is full of nonsense, but I do not know. The total amount of money, not including tax, I think, is $ 118.12 dollars. Am I doing something wrong? Please tell me. I award the best answer 10 points. Thanks.

The heating and decoration no need to "adjust" the water. However … you need for your tank, ideally, you should do before bringing home the fish. This is a process that can take about 6 weeks. You need to research how the cycle of a fish bowl, as this is a very important process. Without a cycle, the fish will die. Your teacher is just that can not buy fish immediately, but has the wrong motivation.

INCREDIBLE 45 GALLON TROPICAL AQUARIUM SIMPLY AMAZING RARE FISH