Hi
First of all about the blue you're trying to breed now - if he's acting aggressive and the female's not acting interested, seperate them. Feed the female lots of live or frozen foods for a while and let her get realy fat and gravid. When she's full of eggs and ready to breed, put the male in again and things should go smoother ie: there should be less aggression.
Concerning the opaline, my first inclination would be to ask whether you are certain the fish is a male. Obviously, if it's in fact a female, there's no way they could breed

However, by the sounds of it, the issue would be something else. It could well be age/maturity. What can always help in these situations is to isolate the male in a tank with no other gouramies for a while and, at the same time, condition the female with live foods in a slightly warmer tank until she looks ready to breed. Then put them in together again and you should find that the male, having been all alone for so long, responds immediately. It can often help to be adding the female to the male's territory if you try this.
So, if you do have a spare tank to put your male in, keep him in there alone at an ordinary temperature. meanwhile, in another tank, raise the temperature and start feeding the female all sorts of live/frozen foods such as bine shrimp and bloodworms. As soon as the female looks plump and full of eggs, raise the temperature in the male's tank so it's just higher than the temperature in the female's tank (do this over a period of a few hours so as not to shock him) and then add the female. Lowering the water level at this time can also help - as can doing a large water change.