OK, now that I know I want to have "dwarf" cichlids in my 30, I need to know which varieties are going to be less that 4" in length at adulthood. So far, I gather that Labidochromis are going to be in this category, what else is there?
Not all Labidochromis can be considered dwarfs. Labidochromis sp. "Hongi" can get pretty big.
True "dwarfs" are in the Pseudotropheus genus which remains a shaky genus right now. Many of which will eventually be reclassified.
There are several species of mbuna that stay under the 4" mark. Other than the various Pseudotropheus species, there's also Cynotilapia and Tropheops species, although I wouldn't recommend any Tropheops species for a 30 gallon.