I like what your doing with the mangroves. Living in hawaii I've always had saltwater tanks but only recently have I tried a planted brackish water Opae ula tank! So far so good!
I am getting really into natural biotopes now instead of the usual SPS cluster Fest that people normally do.
I have decided to go with Aratus pisonii and Scylla serrata and maybe Uca pugnax for live stock. Not sure if I'm going to go with any fish as most natural fish are brackish and not pure saltwater.