The glowing coloration of the GloFish will not fade or change - it is within their genetic structure and will actually be passed on to their offspring should they spawn. To see them "glow" at their best, keep under blue "actinic" lighting. The colors will be bright under white lighting but will not "glow" as brightly.
GloFish Blue LED Aquarium Bubbler | Petco
The Glofish is a genetically modified zebra danio that comes in several different fluorescent neon colors such as red, green, orange, blue and purple. You can now get other species such as glofish tetras as well. The Glofish was genetically modified with the purpose to detect environmental pollution. Scientists were able to inject a fluorescent protein gene (from marine organisms) into the zebra danio embryos to create the glofish. There are no dyes or color injections into this fish. Successive offspring get the gene passed down to them from parents. They are still working on developing a fish to only fluoresce when in the presence of pollution and a portion of glofish sales goes to the advancement of this research.
GloFish®, Cosmic Blue® Danio (Danio rerio)
That sentiment is echoed by Catherine Langford, product manager for environments at (UPG), who said that many customers end up making an unplanned purchase of GloFish when they browse through a store and are amazed by the beautiful colors. To take advantage of those impulse sales by first-time fish owners, UPG offers GloFish kits through its brand in a variety of sizes and shapes. The kits include an aquarium, a filter, a pump, and a blue LED light stick. Some kits also include samples of food and water conditioner.
GloFish®, Cosmic Blue® Danio · View larger image
A good display is an important selling tool when it comes to the GloFish category. Blake recommends setting up a tank with black gravel and blue LED lights to really highlight the colors.
“We provide free merchandising support for retailers, because we know that having the right mix of fish and the right lights is crucial to having a successful GloFish display,” Blake said.There are some reasons for products engineered or labeled specifically for GloFish. One is that consumers tend to shop by type of fish. Also, many GloFish products are designed to enhance the fluorescence of the fish. For example, GloFish Light Sticks are blue LED lights, which make the color of the fish pop, especially when all other lights are off. GloFish Flake Food is specially formulated to enhance the color of GloFish.Tetra recently relaunched its entire plant line, shifting away from solid bold colors to new and brilliant fluorescent colors which react under their GloFish blue LEDs. These plants take advantage of the popularity of GloFish and make it easier to transform existing aquariums into a GloFish experience.Glofish lights work the best for smaller tanks around 20 gallons because one light will have sufficient strength to light up an entire aquarium of this size. Glofish lights can also work extremely well for larger tanks that are longer rather than deeper, such as breeder tanks.
Generally, Glofish lights are used solely on the basis of their blue color. Glofish lights should not be used as your aquarium's prime lighting source typically, because they do not support much plant growth, and simply because your fish may want to see more light than dark blue. However, Glofish lights are inexpensive, and great fun to flip on during night time to enjoy your neon fish light show.