You need to acclimate mangroves quite slowly if they have been in freshwater. Often they will drop their leaves after shipping due to stress but I have always had them grow back. The thing is, they do not really grow in freshwater naturally. From the research I have done, there are very, very few found far enough up estuaries to be in freshwater. I have been told not to buy mangroves that are raised in freshwater but I think it would still be worth a shot. If they are cheap. If they are in freshwater though, you do not have to worry as much about magnesium because they are not using it as much to filter out salt. The other way some mangroves filter salt is by dropping their leaves but I do not believe Red mangroves do this. The nice thing about Red mangroves as well is that they do not need a substrate to grow, they will just root down onto LR.
I lived very close to mangrove swamps and estuaries in Florida and they are such cool trees. Its amazing how big and intricate their roots get. Even in Florida its hard and very expensive to get big mangroves because they are protected. You had to buy cultured trees and I used to see 4-5' trees selling for hundreds.
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