Jellyfish tank - Update 3, I lost one :(

[amzar123]

Hi everyone, I'm back home now so thought I'd do an update on my jellyfish tank

Sadly one died while I was away and I'm looking for a permanent solution to the high nitrates from such a small system

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[dkeller_nc]

From a chemistry perspective, I don't think there's going to be a lot you can do about the nitrates without substantially modifying the filter system. However, looking at your tank on Cubic Aquarium's site, it appears that connecting external equipment is possible. What I might recommend is connecting a small cannister filter equipped with carbon and a fair amount of aragonite coral sand. This will act as a "Deep Sand Bed in a Bucket", with substantial dinitrification capabilities.

With that surface area in a cannister, you can then carbon dose the system with vinegar. Given the system's water volume of 20L, very little vinegar would be required (or advisable). I'd start with 0.1 mL per day added with the food. It may take about 4-5 weeks for the cannister filter to get populated with the bacteria that reduce nitrate to nitrogen gas, but I suspect that you will find that you'll have undetectable nitrates in the long term.

You will also need to add some means of removing phosphate. Water changes will do it, but are a pain and somewhat disruptive to the tank's inhabitants unless the new water is very carefully temperature controlled and has the same alkalinity and pH.

A better plan would be the inclusion of a small amount of GFO in a mesh bag in the system's filtration area.

[Scorpius]

I've been eyeing this tank, but my suspicions of keeping the water stable and "clean" have been confirmed.

[Devaji108]

WOW I have always wanted a jelly tank. keep us posted.
your voice is amazing BTW total ASMR...

[amzar123]

From a chemistry perspective, I don't think there's going to be a lot you can do about the nitrates without substantially modifying the filter system. However, looking at your tank on Cubic Aquarium's site, it appears that connecting external equipment is possible. What I might recommend is connecting a small cannister filter equipped with carbon and a fair amount of aragonite coral sand. This will act as a "Deep Sand Bed in a Bucket", with substantial dinitrification capabilities.

With that surface area in a cannister, you can then carbon dose the system with vinegar. Given the system's water volume of 20L, very little vinegar would be required (or advisable). I'd start with 0.1 mL per day added with the food. It may take about 4-5 weeks for the cannister filter to get populated with the bacteria that reduce nitrate to nitrogen gas, but I suspect that you will find that you'll have undetectable nitrates in the long term.

You will also need to add some means of removing phosphate. Water changes will do it, but are a pain and somewhat disruptive to the tank's inhabitants unless the new water is very carefully temperature controlled and has the same alkalinity and pH.

A better plan would be the inclusion of a small amount of GFO in a mesh bag in the system's filtration area.

You've pretty much come up with exactly what I was thing except with a 20 litre sumo to double the water volume and I can add a tiny protein skimmer