it's a nice mixture of cichlids (when I used to keep fish, I had lots of those in my biggers fishtanks) those are mostly the mbuna variety (cave dwellers) so it would be nice to build some caves and crevices for them.
Agreed, once a tank is set up with proper filtration maintenance becomes very low. the idea is also not to overstock so you keep the waste low and oxygen levels high. One thing that did happen to my brother once upon a time, was he closed all his windows in his flat, but did not turn his tank heaters off - the flat itself got very warm and a lot of his fish died of stress