Shoaling fish, or fish that swim in small groups, can quickly dwindle in number in our aquariums. They play nice in the wild, setting up their dominance structure and residing peacefully on large areas of the reef. Inside our tanks however, they quickly pick each other off, one by one until your group of 6 chromis or cardinalfish dwindles down to just a few, if not only one. To get a shoal of fish to remain as a shoal, you must have a very large tank with plenty of room for the weaker fish to hide from those trying to exert their dominance.
Tip of the Day – 4/11/20110