yooung woman feeding bloodworms to betta fish in aquarium

Bloodworms For Betta Fish: The Best Aquarium Snack

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Bloodworms are one of the most commonly available foods for aquarium fish and are a favorite among betta fish; these worms can be found live, frozen, or even freeze-dried. Some betta fish like them so much that hobbyists even have their own bloodworm farms to keep up with the demand. While a tasty snack, bloodworms can be too rich and fatty to feed your betta fish regularly. Because of this, it’s best only to give a couple of bloodworms to your betta once or twice every week!

Keep reading to find out everything you need to know about bloodworms, how they’re packaged, and the best amount to feed your betta fish at one time!

What are bloodworms?

In the scientific world, there are technically two different types of bloodworms, those that come from the Chironomidae family and those in the Glycera genus. Bloodworms from the Glycera genus are true marine polychaete worms and can deliver a venomous bite. Luckily, you will not experience these types of bloodworms in your betta tank or in the aquarium hobby at all!

Aquarium bloodworms are from the Chironomidae family and aren’t actually worms at all. These small ‘worms’ are actually midge fly larvae that have bright red bodies as the result of hemoglobin being visible through their exoskeleton. These insects can stay in their larval state for up to three years, and only last as a mature midge fly for a couple of weeks; in their adult form, these bugs closely resemble mosquitoes.

Are bloodworms good to feed your betta fish?

Bloodworms are good for your feed betta fish in moderation. They tend to be high in protein and fatty, but lack a lot of the important nutritional value that bettas need otherwise. Because of this, bloodworms are best given as a supplement instead of the main component of a betta fish diet.

How often should you feed your betta fish bloodworms?

In general, bloodworms should always be considered a snack for both freshwater and saltwater fish. Bloodworms simply don’t have all the nutritional value needed to keep your betta fish strong and colorful. Your main betta fish food should be high-quality fish flakes or pellets that are high in protein; betta fish need to eat between 1-3 times a day. Live, frozen, or freeze-dried bloodworms may be given 2-3 times a week during one of those feeding slots.

Along with not fulfilling a good and healthy diet, bloodworms can get to be expensive; because they need to mature into full midge flies before reproducing, it is a little more difficult to set up a breeding container, though betta hobbyists have had success. Live bloodworms have an especially short shelflife while frozen and freeze-dried bloodworms can feed your betta fish for a longer time.

Live bloodworms

live bloodworms

Live bloodworms are the best option to feed your betta fish in terms of nutritional value. However, live bloodworms tend to be the most expensive per serving size and they are highly perishable if not kept in the right conditions.

Live bloodworms are also a good option if you have a recovering, lazy, or overweight betta fish. Seeing live prey should make your betta fish interested as a natural carnivorous predator. This can serve as a source of enrichment and activity. If your betta fish isn’t currently hungry, then the leftover bloodworms can live in the aquarium substrate for a couple of days; in the meantime, it is likely that your betta fish or other tank mates will probably eat them first though!

When feeding live blood worms, it is best to feed one by one; remember that your betta fish has a small stomach and only a couple of bloodworms should be offered in one sitting. This will also prevent too much from being wasted and give your betta fish time to hunt between bloodworms.

Frozen bloodworms

Frozen bloodworms are best to buy if you want to be able to keep the worms for a longer period of time or if you want to save some money, especially if your betta has hungry tank mates. Frozen bloodworms also usually come in preformed ice cubes that are easier to cut up and manage portions a little better so you can feed according to the stock in your fish tank.

Frozen bloodworms need to be thawed before they are dispersed into the aquarium. This can easily be done by taking some fish tank water and dethawing the cube. Some hobbyists like to turn the filters in their tank off before pouring the bloodworms in to keep them from getting sucked up into the filter, but if you have particularly hungry betta tank mates, it shouldn’t be too much of a problem.

When looking to buy frozen bloodworms, it’s best to go with higher quality brands. This will ensure that you’re getting more worms than water and that they are full of protein to keep your betta full and happy.

Freeze-dried bloodworms

Freeze-dried bloodworms should not be offered as much as live or frozen bloodworms, but they’re still a good treat to feed your betta every now and then. The problem with freeze-dried bloodworms is that most of the nutritional value has been removed from them in the freeze-drying process. It is also possible that the mixture is made up of other unknown fish and animals as well.

In addition, freeze-dried bloodworms have been known to cause constipation in betta fish. Without any treatment beforehand, freeze-dried food expands in the gut, which can lead to blockages and constipation for your betta. It is best to take some fish tank water and let the freeze-dried bloodworms soak for a couple of minutes before offering them to your betta.

Like frozen bloodworms, you should always try to buy the best brand of freeze-dried bloodworms for betta fish as possible in order to get the best protein possible.

Is it okay to feed a betta only bloodworms?

No, it is not okay to feed your betta fish only bloodworms, even if you’re switching it up between live, frozen, and freeze-dried worms. Betta fish need a varied diet with lots of high-quality foods to keep them active and colorful. If you feed your betta too much junk food, it is possible for them to become overly lazy, overweight, or develop digestion problems.

betta fish in aquarium eating bloodworms

What happens if you feed too many bloodworms to your betta?

But what would happen if you offer your betta fish too many bloodworms?

Eventually, too much of a good thing can quickly become a bad thing. Not only does an excess of bloodworms affect the health of your betta fish and other tank mates, but it will also start to affect the overall health of the aquarium system. By overfeeding bloodworms, your betta may experience digestion issues while your fish tank might experience excess nutrient inputs and parasitic infection.

Digestion issues

Bettas seem to experience digestion issues much more easily than other kinds of tropical fish. This means that it’s especially important to make sure that your betta is eating and expelling waste more regularly and that there are no signs of bloating or other abdominal bulges.

As mentioned before, freeze-dried bloodworms have to be soaked in fish tank water before your betta can eat so that they don’t expand in the gut and lead to blockage. While using live and frozen bloodworms lessen the chances of this happening, feeding your betta too many bloodworms at once can eventually lead to a blockage and/or obesity.

Nutrient input

Every time you feed your betta, you are introducing a direct source of nutrients; some bloodworms get eaten while the rest get stuck in the substrate or in the filter to rot. While the bacteria and other microorganisms in the aquarium need the nutrients that come from this rot, too much at once can lead to problems with the parameters in your betta tank.

Rotting food can quickly lead to ammonia spikes, which can start to affect your betta fish if allowed to get too high. Other nitrates and phosphates released from the uneaten food can also lead to unsightly algae throughout the fish tank which can be a headache to later remove.

If you’re lucky and don’t experience an ammonia spike or algae problem, uneaten food will still likely lead to cloudy fish tank water that can usually be cleared up with a couple of water changes. However, your betta tank will still continue to have problems as long as you feed your betta fish too much at once.


Unfortunately, live bloodworms are known to carry many parasites; this is why many hobbyists resort to breeding their own bloodworms in a separate fish tank so that they can monitor the health of the population and, in turn, of their betta fish.

While the chance of parasites can’t totally be avoided if buying bloodworms from a pet store, you may have better luck going to an aquarium-specific store. When going to buy bloodworms at the store, it may even be appropriate to ask to see the tropical fish being fed to see if they’re using the same worms as they are selling; this should give a good indication that those bloodworms are also saved for your aquarium!

If the thought of introducing parasites into your aquarium makes you nervous, then it is best to stick with only frozen or freeze-dried bloodworms for your betta.

Why isn’t your betta fish eating bloodworms?

If your betta fish isn’t eating bloodworms but is eating other healthy foods, then there’s probably little cause for concern. Betta fish are notoriously picky eaters, and perhaps yours just doesn’t like the taste of bloodworms; there’s no downside to your betta fish not liking bloodworms, you might just have to try a different treat!

However, if your fish is refusing all types of worms as well as other betta food, then there may be a problem. Loss of appetite could be a symptom of almost every aquatic disease, infection, or parasite. If you start to notice that your betta fish is acting funny, test fish tank water parameters immediately and make sure that the aquarium system is functioning as it should. Check your betta for signs of injury or stress, and proceed with treatment.

If you have a recovering betta fish, then it might be best to buy some extra bloodworms for them. Not only do they taste good, but live bloodworms may also help your betta start to feel more active and motivated to get back to their regular self.

If you think that something else could be causing your betta fish to spit out its food during feeding time, make sure to check out our guide here.


Most betta fish love bloodworms and can’t get enough of them! They can even be used to help partularly picky or recovering betta fish to get into feeding more regularly. However, they’re not the best source of nutrition and will not sustain a healthy betta diet; bloodworms should only be fed a couple of times a week with other high quality betta flakes and pellets being the main food offered.

Too many bloodworms can lead to your betta having digestion issues with your fish tank having excess nutrients and parasites. But in moderation, bloodworms make a fun and tasty snack for betta fish and other tank mates!

If you have any questions about live, frozen, or freeze-fried bloodworms, or have had success supplementing bloodworms into your betta fish’s diet, don’t hesitate to leave a comment below!

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