Hmm.... I respectfully disagree. This is a fish I've seen several times and have wanted for a while.
Silver Gourami isn't a particularly popular name for
Trichogaster trichopterus. Though it appears to be (perhaps) a color morph of this species, which is commonly called the blue gourami. I don't think this is a blue or silver gourami, though. These have a more elongated, streamlined body and a more pointed snout.
Instead, I believe you've got a female Dwarf Gourami (
Colisa lalia). These are distinguished from the males by a general lack of color and a rounded dorsal fin. Check this image, as your fish resembles this female closely:
http://www.aquariumfish.net/images_01/gourami_neon_blue_female.jpg Here's the page it's associated with:
http://www.aquariumfish.net/catalog_pages/gouramis/gouramis.htm#top2
If it is indeed a Dwarf gourami female, then you're quite lucky. These are very hard to find! I've only seen them once in a store, and online at aquariumfish.net. I tried to find a mate for my males for a while, so as to reduce aggression, but was not successful. They just don't sell well enough for LFSs to buy them--they usually get the more attractively colored males, e.g.
http://www.aquariumfish.net/images_01/gourami_neon_blue_male_02.jpg
These females are used to mate Neon Blue Dwarf Gouramis, Powder Blue Dwarf Gouramis and Dwarf Gouramis, all of which are
Colisa lalia