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Below are links to the most common questions about GloFish® fluorescent fish that we hope you will find helpful. If you don’t see the answer you are looking for, please contact us below.

Most Frequently Asked Questions:

Can GloFish® fluorescent fish be sold or purchased outside of the United States? GloFish cannot be purchased or sold outside of the United States, and there are no circumstances where we are able to assist with such a purchase. While we are studying the viability of selling the fish outside the United States, we have no definite plans to do so at this time.

I think my GloFish may be sick. What should I do? If you have specific questions regarding a potential illness, the best suggestion we can offer is to contact a local veterinarian who works with fish and/or your local fish store, as they will often be the best sources for guidance in such matters. There are many factors, which may contribute to the health of a fish, and without actually examining the fish, it is extremely difficult to accurately diagnose the problem. When assessing any symptom, it is important to remember that aside from their color, GloFish® fluorescent fish are just like other fish.

Is my GloFish pregnant?

Aside from their color, GloFish are the same as their non-fluorescent counterparts in every way. This includes everything from general care and temperature preferences to growth rate and life expectancy. Accordingly, females carry unfertilized eggs upon reaching maturity, resulting in a “pregnant” look. However, they will not actually lay eggs without the presence of a male. Even when males are present, it is extremely rare for them to successfully reproduce in a home aquarium without outside help. In the unlikely event that your fish do reproduce, please remember that their sale is covered by a substantial number of patents and related intellectual property, and any intentional breeding and/or subsequent sale of the fish is prohibited. For a complete license statement, please visit our License page.

What should I do if my fish is behaving in an unusual or aggressive manner?

Like any other animal, fish are individuals with their own unique “personalities.” While their actions may sometimes seem strange to us, there is a relatively wide variety of behaviors that fish can normally display. However, if you have any doubts as to whether your fish’s behavior is normal, we would recommend contacting either your local fish store or a local veterinarian who works with fish. Both are fantastic resources for fish-specific questions or concerns.

Is there a recommended tank size and/or stocking density for GloFish?

GloFish® fluorescent fish are schooling fish. Because of this, they are able to thrive in relatively high densities compared to many other fish. Recommended stocking densities vary depending upon the literature source, tank configuration, filtration system, and other factors, so making a specific recommendation is difficult. We recommend consulting with the experts at your local fish store before starting a new aquarium or adding to an existing community.

Aquarium setup and maintenance questions

Below are answers to the most common questions we receive about setting up and maintaining home aquariums.  In general, if you have a specific question about your particular aquarium, the best source for guidance is your local fish store.  In addition to checking with local experts, you may also find the tips and information on our GloFish Care page to be helpful.

  • What are the recommended pH levels? Aside from their brilliant color, fluorescent fish are the same as other fish, and accordingly, the pH level requirements are the same.  While the recommended pH level varies somewhat depending on the source, a pH range between 6 and 8 is generally fine. For additional information on this, we would recommend checking with your local fish store.
  • Do I need to use a filter? We strongly recommend using a filter. Because an aquarium is a living biological system, it will produce various toxins that should be removed from the water. A filter helps remove these toxins and also houses the majority of the beneficial bacteria, which are vital to maintaining healthy, happy fish. Please check with your local pet shop for advice on what type of filter would work best for your aquarium. For additional information on aquarium filters, please visit AquariumOwner.com.
  • Will blue (actinic) or black light harm my fish?
    • Blue (Actinic) Light: We have never observed or heard of any problems related to the use of blue (or actinic) lighting with our fish.  It is also worth noting that people and animals are exposed to blue wavelength light every day, as it is part of the visible light spectrum.  As with any light, however, it is important not to keep it on continuously.  For additional lighting and display information, please visit our GloFish Display page.
    • Black Light:  Although we have seen statements suggesting potential risks for aquarium fish from long-wave black lights, we are not aware of any factual basis for them, nor have we ever observed or heard of any first-hand problems.  Because of this, we have no reason to believe there is any concern with using long-wave black lights with our fish.  As with any light, however, it is important not to keep the light on continuously.

Other Common Questions:

  • Where can I buy/find find GloFish in the United States?

    For a list of GloFish® fluorescent fish retailers in your area, please visit our Store Locator. Because inventories change relatively frequently, please check with your local retailer for details on availability and pricing. If you live in California, please click here.

  • What other fish are GloFIsh compatible with?

    Like their non-fluorescent counterparts, our fish are community fish and will “play well” with other fish. However, not all fish are this way, so we generally advise that people check with their local retailer for specific information on whether their existing fish can peacefully co-exist with GloFish. Alternatively, for a partial, but still significant, listing of other community fish, please visit Badmantropicalfish.com. One point in particular to note is that our GloFish® Electric Green® Barbs can potentially become aggressive if they are not kept in groups of five or more. This is not necessary with our GloFish® Danios or GloFish® Tetras; while they prefer to be in groups of five or more, they will not become aggressive in smaller numbers.

  • Are GloFish freshwater or saltwater?

    Like their non-fluorescent counterparts, GloFish are freshwater fish. They should not be placed in a saltwater environment.

  • How can I become a retailer/wholesaler of GloFish within the United States?

    For more information about becoming a wholesale or retail provider of our fish, please send us a message through our contact form below, and we will respond to you as quickly as possible.

  • Where can I find photos of GloFIsh for my publication?

    Please feel free to use any of the photos posted in our GloFish Gallery. Please credit the photos to www.GloFish.com. It is not necessary to contact us for specific permission.

  • Will there be new colors or species of GloFish?

    New types of GloFish may become available from time to time. Any announcements related to this will be posted on our Facebook and Twitter pages.

  • Restrictions on breeding GloFish

    As outlined in our licensing statement, the intentional breeding and/or sale, barter, or trade, of any offspring of GloFish® fluorescent fish is strictly prohibited.  As we hope you will understand, it is necessary for us to protect the very significant investment we have made in the development of GloFish.  For more information on the patents and related intellectual property rights that cover our fish, a complete licensing statement can be found on our License page.

  • Are GloFish dyed, injected, or individually altered?

    No, they are born beautiful!  GloFish® fluorescent fish are traditionally bred; they are not dyed, injected or individually altered in any way.  Their unique color is a hereditary trait that is passed from generation to generation, just like any other genetic trait.  For more information about this topic, please see the question entitled, Exactly how is the fluorescent protein gene added to the fish?

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