My fish experiences are quite limited, at the moment I have a tank in my kitchen with a Lionhead, a Pearl Scale goldfish and some snails.
The pond in my garden houses 4 yellow Comets.
When I was younger I had some Black Moors, Fantails and even a pair of Convicts.
I am a bit scared of getting tropical fish, though I really want to. I am just not sure if I will be able to keep them alive and happy.
My motto regarding pets is, if you do not know how to care for them let them be, or learn from a pro. You have to have the money to care for them properly. Some pets are really expensive and difficult to care for. i tend to avoid those, as it breaks my heart if they die or are unhappy.