+1Red tail chalceus, Chalceus macrolepidotus
Both species seem to look very similar, I believe your ID to be accurate. Genus seems to need some clearer guidelinesDisagree, looks like chalceus erythrurus also known as the toucan fish.
Here are some I had.
View attachment 1357132
Same here. Shame that I had to sell mineI'll muddle it up a bit. When mine was young it looked like the OP's. Now it's 10" and it's the spit of the bottom three!! Give it 18-24 months and you'll probably have your answer. Whatever it is it'll be a stunner, I love chalceus.