I know I'm going to get flamed, but they are not in a regular brackish setup. I'm simply just adding about 1/3 more salt than you would normally use in a tank this size. All hte fish seem to be growing fast and eating well. So far so good. In fact the Mono's almost eat more than the Dats for their body weight. If the mons's tart looking poor I'm going to sell them. But so far the combo is doing great in the tank.They are about:
Dats: to 4"
Uarau: about 3"
Mono S.: about 4.5" Tall
Mono A. 1"