Fresh Water Fish

Question

My Fish Tank   Hi Elizabeth,

I would really appreciate some help. I have a 20 gal. freshwater aquarium with 5 fish. The one big fish bullies the others and is probably too big for the aquarium. Can you please look at the attached picture and let me know what you think? Should I bring the big one back to a local aquarium and buy 1-2 other smaller fish? if so, what kind?
These five fish (I don't know what kinds they are - one big one, two that are the same, one black angel fish, and a  plecostomus have lived together for the last 3-5 years.)

Thank you,
Lauryn

Answer
Hello,

You can either take the fish to a store, or try adding a lot of decor/plants to lessen the aggression. If the little ones have plenty of cover, it might help. Alternatively, if you choose to take the fish to the store and get more, I recommend getting a small school of fish such as a type of Tetra or Harlequin Rasboras. They are known to be rather peaceful fish, and stay small. They just need to be kept in groups of at least five. If you are not looking for that many fish, you could get a platy or two.