okay thats great, sorry I didn't want to come across as mean. It's just that a lot of newcomers to the hobby think that they need to change all the tank at once, Trying to save your water bill lol.
Labidochromis typically have more pointed snouts, they are insectivorous in nature, whereas most of the other Mbuna have that typically blunt and wide mouth structure for scraping algae off of rocks.