At 1-2" it'll still be relatively peaceful and should not realy pose a threat towards your gourami. The things about CAEs is that they do get large - to 10" in fact - and, at around 3-6", when they are reaching sexual maturity, they start to display a lot more aggression and also become territorial towards each other. At first, the most they'll do is chase other fish around and the aggression isn't yet very noticeable as it manifests itself only in aggression towards similar looking species. However, they quickly move on to inflicting actual injuries and many will suck the slime coat from flat-bodied or larger, slow fish, such as gouramies. Once large enough to do so, they'll also start eating or, at the very least, attacking smaller fish and, by this time, have stopped eating algae entirely. Most people don't keep their CAE past 6". IME, it's much better to either return or re-home it long before then. If you wish to keep it, a tank of 15-20 gallons is ok temporarily but, once the fish approaches 10", it'll need at elast a 30 gallon. As I think is obvious from the above, this is not a peaceful community fish and should also not be kept with anything that looks similar to it. If you must keep it with something, larger fast-moving barbs or relatively aggressive cichlids are best.
I will keep you posted 
