I got lucky and bought 8 of them for $10 at an auction. There's a Tropical Fish Hobbyist issue with these guys on the cover and a really great article. Basically they are prolific breeders and easy schoolers, just like regular white clouds, but they come from a bit closer to the equator so they like it warmer (white clouds are comfy around 72, sparkles gems do better around 78).
They are delightful, absolutely wonderful fish. They are interesting and colorful, even when not displaying, and they have beautiful fins. I especially like the blue in their eyes when the lights are out, reflecting back into the room. Reminds me almost of emerald-eye rasboras in that respect.