Saltyqueen, great, great, great article that I don't remember ever reading!
To be honest, I initially didn't even think about corals in a display tank with mangroves. In fact, the mangroves in the wild look like a lot like many freshwater setups. I envisioned the roots branching out of the mangroves with little SW fish darting in between them. Then you came along Max
I really like your idea a whole lot. Aesthetically, it might even make for an interesting look, having plants growing out the back of a reef tank. I think the miracle mud would also be a good substrate for the mangroves. As for logistics, well, I wouldn't consider it to be much different from any other sort of hang-on refugium with possibly the exception of more intense lighting and light placement. But again, I have never worked with mangroves so I am unsure as to their lighting requirements...
Keep it up, great ideas!
Take er easy
Scott t.