Yes, I think the majority of people here keep them in full fresh. I have my STs/IT/NGT in full fresh. I think ATs prefer some salt but they can live fine in full fresh.
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To answer your broad and generalized question. No. All datnoids will NOT survive those conditions, as only 2 types are found in brackish water.
Please do some research before you kill these fish.
Then feel free to put your ST IT and NTT in brackish water and see what happens for yourself since you won't listen. Don't bother asking the question if you won't listen to the answrt