hi can i have a pair of yellow labs and a pair of Melanochromis Johanni with a L.calvus??? if i can have the pairs wots the best way to introduce them and stop the males harrasing the females
nope, not a good idea. You can go with the labs and the Calvus, or the labs and the Johanni. I don't recommend the Johanni in any tank smaller then a 40 gallon, 4 foot long, they can be quite feisty.