Danios
Danios should be purchased in groups of three or more. They enjoy swimming in groups and chasing each other. If you buy a single danio your other fish will end up getting harassed. I purchased two Giant Danios and one would constantly chase the other, tearing his fins and scaring him.  After I removed the agressive fish, the remaining danio procceded to harrasse and chase my mollies. I finally had to remover that fish as well.  A friend of mine has three danios and they chase each other but don't do any serious damage.  He also has a betta that gets along fine with the danios.

Danios can also be jumpers and you should make sure any holes in your hood are blocked or smaller than your fish.

Danios are egglayers but will usually eat the eggs before they hatch. If they are left to hatch, they can produce up to 300 babies.

Temperature - 74-78 degrees F.

Feeding Recommendations - Tropical Flake Food, Community Bites, Freeze Dried Tubifex (supplement), Freese Dried Bloodworms (supplement).

Breeding - Egglayer.