Thanks so much everyone, I appreciate all the feedback, and clues to what type he may be.
I think Marcus may be getting sick of me, I even bought a little stool just to go in front of his aquarium so I could admire him. I am sure he's sick of my staring. ;) He actually flares at my finger! Will try to get a good pick so I can figure out tail type. He does seem to blow some bubbles out and just line them up in a row sometimes, but nothing bubble nest-like, like I have seen others post.. and I am guessing it is too soon for that...
I love this forum and all the wonderful picks of theses amazing creatures... I think I am hooked :)