SAmtheman, thanks for your input... I questioned stocking density in the 20 gallon since it does boil down to territorial space. Looks like my slate "two car garage" should work, just need to remove the excess males! Have you observed the males displaying much deeper colors than your females? This is very common in other species but some sources said you can't sex by coloration... Also, it appears the males have faster growth ratios unlike many other species where the female is usually larger and lacking in color...