Welcome to the forum!
I took a look at you pic. You tang looks alittle thin (but I have a yellow tang, and he was a stick when I started with him). I would use caution with those Sponge Bob decorations, I had a Pineapple in my old 37 gallon, and it started leaching paint.
I would definitely recommend you put your Naso in the bigger tank (tangs like a lot of room), and for a 150, if you don't have some high power lights, a FOWLR
is great, and you can always upgrade to a reef later.
I'll watch your career with great interest!