I would say they were very defensive more than aggressive if you know what I mean? They picked their corner and set up camp but it wasn't (and still isn't) like they were chasing everything about the tank. After saying that there isn't really anything big enough to pose them any threat...
Came home today and I had a quick look and was gutted not to see a single wriggler left round the bogwood with the female! Soon cheered up though when I noticed about 40 free swimming fry hovering round the big male about a foot away up the tank!
Don't want to move the fry too early, 1 because they look so delicate and 2 because it's very interesting to watch but at the same time I'd like even to get some past the "looks like a tasty snack" size...