Glimmerfins swim in shoals of up to 3000 along the rivers. When they mate, they swim to shallow water. The surface looks like an oily rainbow during this frenzy. Glimmerfins are most known for their combustible quirk. The scales of the Glimmerfin contain the compound that gives them their rainbow colors. This compound ignites readily and burns a different color depending on the fish’s diet. It is used in some fireworks and lanterns. Candles are sometimes treated with ground Glimmerfin scales.