Sea-Monkey Care – With or Without The Kit

Sea Monkey Care

My teen recently told me she had a batch of Sea-Monkey eggs, but no kit. If you Google how to care for Sea-Monkeys without a kit, most articles will tell you to buy a kit. But, I was determined to use what we had, so I dug a little deeper.

With some research, I was able to find some information on how to start a Sea-Monkey Colony without a kit. I’m sharing that information here. If you raise brine shrimp, leave us a comment. We want to know your experience.

Ironically, we actually did have a full kit that came with my daughters microscope set, she had just lost the instructions and didn’t know what to do with the pieces. Luckily, the research I had done helped us to know what to do with the kit and when we needed to supplement.

Microscope Kit came with Brine Shrimp Eggs
Our microscope kit came with Brine Shrimp Eggs to hatch and view.

What Are Sea-Monkeys?

Sea-Monkeys are a man-made hybrid of brine shrimp. They do not exist in the wild — or at least not naturally in the wild.

The more I read about Sea-Monkeys, the more questions I had. Are they environmentally safe? Have we released Frankenstein’s monster into the world? I couldn’t find that answer, so I’m assuming they are relatively harmless.

If man-made Sea-Monkeys concerns you, there are two alternatives. In this article, we actually using natural brine shrimp, but we call them Sea-Monkeys. Brine Shrimp (and their hybrid cousins) require saltwater, so flushing them down the drain is unlikely to start a rogue colony in the Mississippi.

Similar to Sea-Monkeys, but natural, you can raise Triops with a Smithsonian Prehistoric Sea Monsters Kit. Triops have existed naturally since the time of the dinosaurs. They exist on every continent except Antarctica, although probably not as far north as Minnesota. (Triops are considered a natural defense against mosquito larvae. Maybe, if you are doing this experiment in the summer, you could keep them in an outdoor fountain?)

What Comes With A Sea-Monkey Kit?

  1. A packet of “Water Purifier“. This basically turns your purified water into a saltwater base. I found directions for creating the necessary salt-water solution on
  2. Sea-Monkey Eggs. If you don’t have eggs, than you would probably want to purchase the kit. Although the video below suggests you could buy live adults from the pet store (they sell them as fish food) and start with the adults rather than the eggs, that doesn’t sound like as much fun.

    Brine Shrimp Eggs for our Sea-Monkey experiment
    Brine Shrimp Eggs
  3.  A packet of “Growth Food”. This turns out to be yeast and spirulina. If you get your ecosphere going, you should not need to feed the Sea-Monkeys after the original packet is gone. They should be able to live off the algae that naturally forms in tanks. If you do feed them, McGalver Blog Spot suggests you only do it once a week.
  4. Some come with a tank or bowl.  Otherwise, you can make a DIY Sea Monkey Tank out of a fish bowl or a jar.  We used a fish bowl we already owned.

How to Make Sea Monkey Water Purifier Substitute:

Sea Monkeys need saltwater. provided directions for preparing our own saltwater solution. We did have some conditioner that came with our microscope, but it wasn’t enough for the size of bowl we were using, so we used these directions to supplement with sea salt. Their salt to water ratio for sea monkeys is 1 to 1½ teaspoons of sea salt to 1 cup* of water. Tap water is not recommended, but if you use it, let it sit for a day before starting the process. *Thank you to reader James for correcting my mistake.

Adding sea-salt to our sea-monkey habitat.
Adding sea salt to our sea-monkey habitat.

YouTube Channel Life in Jars, suggested that getting the balance right is important to Sea Monkey tank setup; and it may be better to just go to a pet store and ask for a quart of water from one of their saltwater fish tanks. Apparently, this worked for him. In retrospect, this step is probably where we went wrong.

12/7/20 Note:  See the comments, Christina tells us that temperature matters. She recommends a mug warmer or an aquarium heater in cooler months. This California State Science Fair project (<-PDF) found that 80 degrees Fahrenheit is ideal.

6/24/21 Note: Reader Christina checked back to tell us she has had great luck in the last six months.  She bought the brine shrimp eggs and aquarium salt from an aquarium store. Her little guys are breeding like mad and are super cute to watch.  So, if you don’t want to buy the plastic kit, she recommends you keep trying.

DIY Brine Shrimp / Sea Monkey Food:

My next question was, “What can I feed Sea Monkeys?”. It turns out that Sea-Monkey food is basically spirulina and yeast, but algae is their natural food source. Theoretically, a healthy tank will grow enough algae to feed your colony. McGalver Blog had good luck with simply feeding the brine shrimp spirulina powder sparingly, once a week. I found a fish food that contained both spirulina and yeast (and other filler ingredients). Most of my research suggested brine shrimp are not picky eaters. This is a possibility if you can’t grow enough algae to feed your colony.

Make An Aquarium Into a Self-Sustaining Eco-sphere

This was a funny, but informative video about creating an eco-sphere that grows the Sea-Monkey’s food and other essential habitat needs.

Is It Worth It to DIY?

No. Buy a kit.

We had absolutely no luck hatching our brine shrimp eggs. None. I don’t know if they were too old or we just messed up one of the early steps. My final analysis is that, if you are planning a long-term colony, knowing how to make your own food and saltwater is worth the learning curve. However, if you are fine with this being a short-lived experiment, purchasing the kit is probably best for your needs.

As our kit did not come with much food, had our eggs hatched, we would have needed to purchase a small bottle of spirulina fish food, crush it and use as needed. This is half the price of the cheapest kit.

Sea-Monkey Kits

Sea Monkey kits are pretty inexpensive. The cheapest does not include a bowl. The more expensive kits come with plastic containers and fun decorations. The microscope kit, which I linked to above, is more expensive, but can be used for a variety of science activities. I would recommend doing the sea monkey experiment right away rather than holding onto it. However you choose to go forward, we have linked to our resources below. We would love to hear about hour experience.

This article contains affiliate links to Amazon and Family Fun Twin Cities receives a small commission on sales through our site.

Sea-Monkey Bowl
Our sad DIY experiment did not work, but we can re-use the bowl and decorations when we buy our kit.



  • Sea Monkey care: The best place to start, is the official care instructions.
  • Background: Wikipedia contained a wealth of useful information and is worth a read for an understanding of what sea-monkeys are and what comes with a kit and also to learn about triops.
  • Science: not only provided guidance in how to make salt water for Sea Monkeys, it also has ideas for incorporating Sea-Monkeys into science projects. To do all of these activities, you may want to purchase a microscope.
  • Feeding Sea Monkeys: McGalver Blog Spot helped me determine what went into food for Sea-Monkeys and explained how often to feed them.
  • Self-Sustaining Ecospheres: Life in Jars is a YouTube channel dedicated to creating ecospheres.
  • Sea Monkey Habitat Temperature: California State Science Fair Project Number J192 by Deanna J. Purther.

More Science Fun to Do Together

12 thoughts on “Sea-Monkey Care – With or Without The Kit”

  1. A kind smile, it works well to DIY if you take into consideration the temperature – as it is essential and will not work if not warm enough.

    I placed mine the first time (350ml plastic tank) on a mugg warmer available on ebay. Second time used a (for a several litres tank) 25c aquarium heater. Hach within 24h.

    1. Hi Lesly. Mine didn’t hatch either and that is why I recommend just buying a cheap kit the first time. My house is drafty and cool and I’m guessing that is where I went wrong.


    The ratio is 1 – 1 1/2 teaspoon of sea salt to 1 cup of water. Not 1 quart. Your water wasn’t salinated enough.

    1. Thank you, James for catching that. I’ve made the edit in article. I hope this helps others have a successful experience.



    Hatching & Raising Brine Shrimp
    Use a glass container as a hatching tank for the brine shrimp, either a wide-mouth quart jar or a shallow glass pan at least two inches deep (this will work best).

    Fill the container with one quart of salt-water solution: mix 1 to1-1/2 teaspoons of sea salt mixture or non-iodized table salt per cup of bottled water.

    (If you want to use tap water, let it sit for an hour so the chlorine settles. You can also use rock or aquarium salt.)

    The shrimp will die in salt water that is either too weak or too strong.

  4. Christina Svensson

    Do not give up. I had a few failures.

    Buy eggs (brine shrimp) and aquarium salt from an aquarium store. Mine are now breeding uncontrollably – no heater needed in summer – water does need to reach 17c

    And they are cute to watch…

    1. Thank you, Christina, for your encouragement. I’m excited to try again now! I’ve shared your success story with our readers.

  5. Chaul Jhin Kim

    What is that bizarre turtle-like thing inside that bowl?


    The next time I wake up, please change my physical form to that of FINN MCMILLAN formerly of SOUTH NEW BRIGHTON at 8 YEARS OLD and keep it that way FOREVER.

    I am so sick of this chubby Asian man body!

    Thank you!


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