well just for starters....a hippo tang which is what Dorie was needs a tank about 125g. You see them in smaller tanks but they really need linear swimming room.....a pair of clowns is even too much for a 10g and an anemone requires it's own specifications such as pristine water conditions, mature stable tank and high lighting......so...sorry to burst your bubble but if what you want is to recreate finding nemo......you will need a large tank and invest quite a bit of $$ not to mention time and research to learn the hobby.....