arent the laticlavius the red tails? if they are, i have seen them commonly grow over 24"
Yes they are and you are right - some do grow larger. However, most don't get that big - certainly not 'commonly'.
Septemfasciatus looks pretty much like
goramy. Try a google search for pics.
Fizban - most gouramies do fine on their own - particularly males of most species who actualy do better alone. Young
osphronemus goramy are, in fact, rather aggressive towards one another. They do eventualy calm down and are peaceful as adults but, like most gouramies, they are still territorial. That's not to say that it wouldn't be nice to be able to keep them in a group - but considering their size, that's just not feasable.
As for the info on that site, the comments can be made by anyone so aren't all particularly accurate. For example, one person said to provide a minnimum of 400 litres (100 gallons) per gourami - that's certainly not enough. Despite that, most of the info.
is quite accurate. The fact that they'll eat anything certainly hasn't been exaggerated (though it's not good to feed the gourami 'table scraps'!) and that first comment was particularly interesting to read and informative.