Are they Red, White, or Black Mangroves? There are many more species of Mangroves, and they are stratified across tropical coasts. Some like to be submerged completely, some floated, and so on. Go to Google type mangroves and always ask your LFS what variety they are...this will give you keys to its proper growth conditions. I have had good luck with growing them, but they are slow at it...
Stephen
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