Fish-less Cycling Program



A Fish-less cycle is the best and safest way to cycle your aquarium without harming any jellyfish or fish. It involves placing a “pea” size (⅛” or 6mm) piece of raw shrimp into your filter box under the drip tray. If your aquarium does not have a filter box or drip tray, then you can place the piece of raw shrimp directly into your tank to decompose.

The decomposing raw shrimp will begin to create ammonia and start the cycling process. As your system goes through the cycling process, you will check in with us once a week with a picture of your API test readings and we will both record your findings.

After about 2 weeks, we will see the ammonia level rise and then start to decrease to zero. The nitrite level will then begin to rise. Maintain the proper salinity in your aquarium by adding a bit of distilled or RO water each week. After another 2 weeks, the ammonia will return to zero and the nitrite won’t be far behind.

Once the ammonia and nitrite levels return to zero, your system is cycled! Your pH will be a bit low, so conduct a 10% water change the day before receiving your new jellyfish. You must strive to always have a 0ppm level of ammonia and nitrite in your aquarium. Don’t overfeed and don’t do more than a 30% water change at any time.

The process of cycling a new aquarium is often overlooked and can create problems right from the get-go. Jelly owners who do not allow their tank to completely cycle end up with unhealthy jellyfish and become confused about why their jellyfish are not well. Cycling is a crucial step in starting a saltwater aquarium of any kind and in the survival of any saltwater animal, not only jellyfish. However, since jellyfish are 96% water and rely heavily on water chemistry, they need a biologically stable environment to thrive in. There is flat out misinformation going around the internet about how long cycling takes. It takes no less than 4 weeks; it’s just biology. Even with the use of bio-starters, you must still cycle the aquarium and will still take 4 weeks minimum.

cycling graph

This is where we come in. We will keep track of your weekly water quality readings with you to make sure you’re on the right track! You will need to purchase an API Saltwater Test Kit with pH, ammonia, nitrite, and nitrate. If you choose to participate in this program, you are agreeing to submit weekly water quality readings and pictures.

This program is completely free of charge for everyone! We only want to help new jellyfish owners have a successful kick-off in starting their new tanks!

Open to all jellyfish aquarium owners, regardless of the type or brand of tank. If you choose to participate in our Fish-less Cycling Program © and complete it, you will receive 3 FREE small moon jellyfish with your first order of jellyfish.

***For new Eon owners: If you just purchased an Eon Jellyfish System and sign up for the Fish-less Cycling Program © and complete it, you will receive 6 free moon jellyfish with your first order of jellyfish, along with the free frozen food offered with the Eon purchase.

Sign up now by filling out the form below, or at

We will contact you via email with more information & details on how to get started.



  1. Hey guys,

    Thanks for this! I feel like this might have been made specifically for me as some of the literature from Cubic indicated that you can successfully cycle the tank within a week or two. Anyway I have a few questions:

    1. if you have an external canister filter in addition to the aquarium – does that affect the cycle time/process? Right now I have a nano canister filter that does approx 160gph (I know it’s less since it has to work through all the tubing but figure 80-120gph).

    2. Does lighting affect the cycle – specifically if the light is LED and has a UV component (I.E. PrimeHD light)

    3. Once the tank is cycled – can you clean the algae off the bottom and glass sides and/or clean out the sponge?

    4. How long after the tank is cycled can you introduce livestock. and should you do it slowly? Like some of the reef blogs I’ve read say 1 animal per month.

    5. What is the optimal temperature for the cycle and then to keep moon jellies?


    Liked by 1 person

    1. Hi Patrick!

      1. If you have the canister filter set up at the same time you are cycling the tank, it will not take any longer to cycle.

      2. Lighting does not effect the cycling process directly.

      3.Yes… once the tank is FULLY cycled you can clean the algae, do a 10% water change and exchange out a carbon filter.

      4.You should introduce livestock right away after cycling. Don’t let the system go without bio-load for more than 2 days after cycling. If you need to wait for some reason to add animals, simply add some fish food to keep the beneficial bacteria filters fed.

      5. Room temp is good: 68-78ºF.

      Thanks for being so diligent and on top of your jellyfish care!! WE LOVE THAT!


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