great looking gouramis!! I have one of each also....they get to 6 inches ...fems staying more around 5 ....but both are super territorial and don't tolerate others of their own kind after getting use to their environment ....
I also have an opaline and a golden... I see golds all the time now with black marking but mine never got any? Are the black spots on golden normal or is that a hybrid from a gold and opal or blue? Here's a pic of my gold, but all I have seen since is colored like the ones you have. I'll make a new post for it so I don't hijack yours
Oh cool. Does it say what species they were hydridised with? It is funny the nomenclature doesn't reflect this. Also, of course, there is usually a bit of a taboo against propagating hybrid fish mostly due to the unpredictable outcome of subsequent generations breeding so they are usually pretty clearly identified as such.
Oh and also, what book? I'm kind of interested in labyrinth fish so I'd like a dedicated source.