^^ Well YEAH, that's a 450g!
Big difference.
Hard to say what I would do, I keep just one tang in my 150g
Limited space w/ tangs tends to lead to claiming what little territory they have.
When I say ticky, I mean obvious signs they are not exactly buddies, maybe a little tail flashing, or it could get worse, yes.
I would like to think you could pull one if it doesn't work, and most likely could, but there is that chance of a bad boo boo.
I've been wacked by a tangs spike before, it can be pretty nasty.