Those seem cool, i was under the impression magroves were salt water.... also how fast would these trees grow? cuz obviously i couldn't have a tree coming out of my basement (unless they're not actually trees and i'm just an idiot
No you're not an idiot. Most mangroves are salt water especially the ones you seem commonly available for purchase. There are however mangroves that will grow in brackish or fresh it's just a matter of finding them for sale. From what I've found they don grow particularly fast but you could always bonsai it