My daughter has two aquariums - do you know much about them?
I know some.  The obvious is a place to keep aquatic plants and animals.
She has freshwater fish - guppies, angelfish, and even a cichlid.
I used to work at an office that had a large tank with cichlids.  There are about 1650 species of them!
They are so pretty  - but also pretty aggressive - her's is in a small tank by itself.
I just have a beta...I did read tht tilapia are a species of cichlid
Really?  I was not aware of that  at all - I had a beta at one time, but he didn't live long
I know I found that strange mystelf.  They are also an invasive species...probably where the aggressiveness comes in