Your second lineup would probably be fine. However, what is the exact species of 'Hawaiin blue puffer' are you speaking of? There are several puffer species that go by that common name, and all of them are quite different. If it's a toby, it will probably pick the lion's fins. If it's Arothron meleagris, it would probably be fine. I'd personally drop the tang and add a wrasse or eel of some sort. Also, you'll probably want more than 45lbs of rock. That'll look pretty bare in a 125.