The 2 water crabs are both brakish, fiddlers need to be in groups, they need a terrarium with more land then water, they should not be in a tank with fish, at least not fish that you don't care if they get their fins ripped off, or worse.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.