I love mangroves they are extremely tough plants- outside
once we bring them indoors it's always best to err on the side of caution
My tank is a 75 gallon Amazon biotope with sand, an aquatop canister filter, and a orbit marine LED. And my new phone won't let me upload photos.
They really do better brackish long term most FW fish can handle a bit of salt as well.
What sort of freshwater tank are you bringing it to? Can you post pics?
If you are not trying to grow FW plants in there already...