I know that you add water, heater and filter. I have a 10 gallon tank. My main question is how do you cycles the tank? Does it have to be cycled or not? The same question for fry tank. A hospital tank is supposed to be safe right? But wont a nitrite spike effect the sick fish or the fry? Could anyone tell me how to setup a hospital or a fry tank step by step.*SUNSMILE*