The tank has a good amount of live rock. I want to add some soft corals from my other tank, just haven't gotten around to it.
I have no intentions of keeping the eel with smaller fish. As the fish mature, I only want my dwarf lionfish, coris wrasse, and eel in the tank. Depending on how fast my tang grows (about 4" now), I may keep that in the 75 long term as well. I may get a few small damsels occassionally just to keep the predators on their feet. My coris wrasse seems to love it when I give him an occassional live urchin or shrimp to eat.
Hopefully, it will change to a blue male. From the thread I referenced, it seems to take from a few months to a year for the change to take place.