This school of fish is called the Clown Rasbora (Rasbora kalochroma). They look like Dwarf Spotted Rasbora in terms of coloration and pattern but much bigger. When it comes to behavior, they're tight schoolers and docile. They are calm and peaceful towards tankmates even with the smaller ones like adult Dwarf Shrimps. However, baby shrimps will be eaten. Max size is 4". Yes, they're huge for a Rasbora species. They will be needing a bigger swimming space. A 50gal tank will be adequate to house 1