hey sam i got a 60cm tank with a few gold fish i am getting sick off, it has a air pump and filter, with gravel and i think about 5 fish ?
i got other tanks at my house which are warm water and its a pain in the butt when you go around to change water cause there are so many tanks,plus you either got to turn up the temperature or use another heater to keep the water constant !!
i had a 2m tank before i had sell, which had a minireef and that took ages to clean !!!
cold water fish is the easiest way to start, they don't require much maintenance except for change of water every now and then, air pump and food