Real mangroves would be nice, but you'd be looking at at least 10 years before they grow to a nice size for that tank. Maybe you could import some but that might prove difficult you can only get the pods easily in Canada.
This is going to be a really neat tank! Maybe you should use real mangroves as the filtration to go along with the fake structure. 10 years down the road you might be able to take the fake ones out
