The Giant Danio's have proved to be interesting, started out with 3 to fish cycle my 40 gallon breeder. They have grown from 1.5 inches to almost 4 inches and are full of colour now. One thing that takes getting used to is their Speedy Gonzales behaviour... man are they fast! You can get dizzy watching them. They school with 5 of the smaller Danio variety and recently I discovered an accident.... I was cycling my 10 gal quarantine with established filter and grabbed a handful of gravel from another tank. Shortly after I spy "micro fish" swimming around. Yes you guessed it, I now have 5 more Giant Danio fry. Might as well have a shoal right!