How big is it going to be?
Is it going to be saltwater or freshwater?

With a little more information on what you are trying to accomplish, we can recommend some inhabitants for your aquarium.

im gonna do it all sorts of waterr types so it dosent matter if its fresh water and salt water and the sise? i have not thought about it.

maybe 34 meters and 15 feet?

For freshwater: Guppies. They sound 'dull' but they are not. They come in myriads of colours & types but require particular attention to their needs.

For saltwater: What about seahorses? These are definitely a challenge to keep, but they are immensely beautiful and interesting to watch.