For the cichlids, I wouldn’t do more than a pair for aggression reasons, but to properly accomplish this you may have to start with a small group.
Other options are scarlet badis or dwarf puffer, but both are rather difficult to keep. There are plenty more options too, but it really depends on how hard your friend wants to look/how much they want to spend.
Other options are scarlet badis or dwarf puffer, but both are rather difficult to keep. There are plenty more options too, but it really depends on how hard your friend wants to look/how much they want to spend.