It depends on the fish and where it is placed if stable or not.Don't worry though a reccomended fish for begginers are goldfish, betta fish, or guppies.But the one I have experience with is the betta fish.
Temperature : 75F-82F
Decor: contains NO METAL, No pointy edges or so
Tank size: the least is a gallon but 5 gallon and up are better size.
Website:
www.bettatalk.com/