Hi; In my experience,its easier with a larger tank,than a smaller one.Conditions are more stable,and if you dont overcrowd the tank with too many fish,things are easier overall.
It all depends what kind of fish you want to keep of course, and I assume we are talking about freshwater fish.Saltwater is another ballgame.
Set up the tank,fill with water, and let it run for afew days; see if you can maintain the desired temps,and then decide on the type of fish and start adding them gradually.
By the way,in my experience,the best way to "kick-start" the bacteria cycle in the tank is to put a gallon or so of water from another mature aquarium.(after the temps. in the new tank have stabilized.)
Good luck.
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