Thank you very much for this complete thread!
I must admit that, thanks to you (or because of you ;-) I have settled a brackish tank with those pretty critters too. They have arrived for a week now and seem to go well ; although they seem a bit shy.
Just a question about feeding. In ecospheres, they are supposed to get all they need without refill (or maybe they're just starving until they die...). In such open/classic tank, how often do you feed them? Did you notice any behavior changing when they're hungry?
Everybody knew it was impossible to achieve. Some idiot wasn't aware of it. And just did it.