Nice! 12 isn't too much though? Not sure how big they get.
I have a question for you. Are sparkling gouramis not like other gouramis? I'm talking aggression-wise. I have peaceful community, and wouldn't want to disrupt that. There is a GBR in there, but he doesn't bother anyone.
1 Gallon Bowl - White/Purple Half Moon Betta
1.5 Gallon - Blue Veil Tail Betta
2.5 Gallon - Red/Blue Veil Tail Betta
2.5 Gallon - Pea Puffer
5.5 Gallon - RCS, Ghost Shrimp, Ember Tetras, Sparkling Gouramis, Bumble Bee Gobies
10 Gallon - Pure Black Bar Endlers
29 Gallon - Planted Community - Cherry Barbs, Neon Tetras, Various Cory Cats, Albino Bristlenose Pleco