Tank size is really limiting. All Cichlids need space, as territorial fih, and a 22 inch cube would only work for a single pair of dwarf Cichlids. The problem is the commonly available dwarf Cichlids a newcomer could try are all from very soft and acid water.
Cubes are pretty but impractical.
I'll propose some work. Go to stores, and see what you like. Limit yourself to 2 or 3 inch fish. Don't ask the store staff, whose job is to sell. Note the names, and then look them up. "Seriously Fish" is an excellent website for that. If you have half-decent stores around you, you'll find a lot of possibilities, and be saved from our suggesting things you can't get.
Cubes are pretty but impractical.
I'll propose some work. Go to stores, and see what you like. Limit yourself to 2 or 3 inch fish. Don't ask the store staff, whose job is to sell. Note the names, and then look them up. "Seriously Fish" is an excellent website for that. If you have half-decent stores around you, you'll find a lot of possibilities, and be saved from our suggesting things you can't get.
