Im 99% sure that within 2 weeks, the haitians will be dead if you put them all together. They get bloat REALLY easy at that size and it seems to be caused by stress, which they will have if they arent the big fish in the tank.
Ive lost 4 to it because I didnt know this at the time. 2 because they were in a community tank and 2 because they didnt like each other in a tank by themselves and fought, causing them to stress out. Also, the haitians need a warmer temp (somewhere around 88 is ideal for them).