Originally Posted by Macscale
A sailfin would get too big, they also don't come from Hawaii.
While you are correct that the Sailfin would outgrow a 125, ( They get larger than 20" tall when fins are fully extended) you missed on their location
They are found in Hawaii. In fact, the largest one we got from there was too large for our 100 gal
tanks and needed to be donated to the Miami Seaquarium back in the 1980s. You can see some pics of them in Oahu here: Sailfin Tang, Zebrasoma veliferum
As for the lionfish, if the OP wants to go pre-volitan invasion natural Hawaiian fish, The Pterois sphex is the native lionfish of Hawaii. A beautiful lion similar in size to the P. antennata.
Hope this helps