With no more than we have to go on, it's impossible to determine what is going on.
If you truly do have 2 saulosi males and they are starting to sexually mature, aggression could be an issue. (2 males rarely work out with any mbuna- better to have one or even 3 with a higher female ratio)
If some of the fish are hiding, that can also indicate illness or aggression problems, so again, no real answers...
How is the saulosi now?
Without a hospital tank, there isn't much you can do other than watch for symptoms or signs of trouble. Make sure all the fish are coming out to eat, and keep a very close eye on the tank for a few days.
You're probably going to need a hospital tank.