Aquariums: So what fish is this

Got this fish off someone, he wasn’t entirely sure what it was, I’ve come to the conclusion it’s a parrot fish of some sort.

I’ve done some googling and can’t quite figure out exactly what it is, doesn’t have the large notch of a normal parrot, but it also hasn’t closed its mouth since I picked it up, so maybe it is?

I’ve been told it’s about 7 months old and It’s currently approx the size of my hand (picture of my hand so you can see the size of my hand)

I’ve put it in my 240, which only has one other resident (EB acara) which I had to take out of my 330 as it was constantly bullying the other acaras and angels in there.

Any specific care advice or food to give? Currently got hikari cichlid gold and live feed shrimp or worms once a week to my tanks.

If I’ve put the post in wrong category then I’m sorry mods, don’t shout at me!