My family and i have got a new tank.I really wanted to know a few things.firstly,do you have to leave the water in the tank for a week or so or can you put neons in straight away because the are good 'cycling fish' i know that they are good fish for starting but i haer they are sensitive to water drops,rises phd levels e.t.c.so i wan to know should i leave the tank for a wee while let it do its thing then put in some strong,hardy fish such as plattys,catfish or guppies that can handle water drops etc or should i put in some neons straight away although i am scared of putting in neons straight away because they are sensitive and i am a begginer.p.s my tank is 4 feet x60 cm. i just wanna know what to put in first and how long to wait. thanks!!!!!