Properly setting up a aquarium to house demasoni is not difficult, start with a 55g or higher, lots of rock work, sand substrate, and good filtration...pretty simple stuff. Now when stocking these evil little buggers start with 20-25 juvies then as your able to determine sex rehome the hyper-aggressive And extra males, with your final numbers should be around 13-15 fish with only 2-3 males remaining. When stocked correctly demasoni is no worse than the majority of mbuna...ok maybe a little worse but some of my favorites especially with demasoni and yellow labs that's my all time favorite but that takes a 75g minimum.