How to Set Up a Jellyfish Tank at Home: Kreisel Design and Care

Jellyfish have a hypnotic beauty that few aquatic creatures can match, and keeping them at home is more accessible than most people realise. This jellyfish tank setup guide from Gensou Aquascaping at 5 Everton Park, Singapore covers the specialised equipment, water chemistry and daily care that these delicate animals require. With over 20 years of experience working with unusual aquatic setups, we can help you avoid the costly mistakes that derail many first-time jellyfish keepers.

Why Jellyfish Need a Kreisel Tank

Standard rectangular aquariums are unsuitable for jellyfish. Their fragile bells and trailing tentacles get trapped in corners, sucked into filter intakes and damaged by sharp decor edges. A kreisel (German for “spinning top”) tank uses curved walls and a gentle circular water flow to keep jellyfish suspended in the centre of the water column, constantly tumbling in slow motion. Purpose-built kreisel tanks are available from brands like Cubic, Medusa and Jellyfish Art, ranging from small desktop cylinders (20 litres) to large display units (150 litres or more).

Choosing a Species

Moon jellyfish (Aurelia aurita) are by far the most commonly kept species and the best choice for beginners. They tolerate a range of salinities (28-35 ppt), accept commercially available jellyfish food, and have a relatively mild sting that is harmless to humans. Other species like blue blubber jellyfish (Catostylus mosaicus) and upside-down jellyfish (Cassiopea spp.) are occasionally available but require more specific conditions. In Singapore, moon jellyfish can be sourced from specialty marine importers; expect to pay $30-$60 per specimen.

Water Chemistry and Temperature

Moon jellyfish thrive at 20-25 degrees Celsius, which means a chiller is essential in Singapore’s 28-32 degree ambient heat. A small inline chiller rated for your tank volume, set to 22-23 degrees, keeps conditions stable. Salinity should be maintained at 30-34 ppt using a quality marine salt mix. Test specific gravity with a refractometer rather than a swing-arm hydrometer for reliable accuracy.

Ammonia and nitrite must read zero at all times. Jellyfish are extremely sensitive to nitrogenous waste, so cycle the tank fully before adding animals. A mature biological filter running for at least four weeks with a source of ammonia is the minimum.

Flow Rate and Pump Settings

The circular flow inside a kreisel must be strong enough to keep jellyfish suspended but gentle enough not to damage their bells. Most purpose-built tanks include an adjustable pump. Start with a low flow and increase gradually until the jellyfish drift smoothly around the tank without being pinned against the screen or sinking to the bottom. Flow that is too strong folds the bells inward and prevents feeding; flow that is too weak lets the animals settle and potentially contact the drain grate.

Feeding Jellyfish

Moon jellyfish feed on planktonic organisms. In captivity, freshly hatched brine shrimp (Artemia nauplii) and commercial liquid jellyfish food are standard fare. Feed once or twice daily, adding the food upstream of the current so it disperses evenly across the tank. Overfeeding fouls the water rapidly in a small kreisel; start with a small amount and observe whether the jellyfish’s stomach pouches fill with orange-brown colour within an hour.

Remove uneaten food with a turkey baster after feeding to prevent ammonia spikes.

Lighting for Display

Jellyfish are translucent and look spectacular under colour-changing LED lighting. Most kreisel tanks come with built-in LED strips offering blue, white, red and green channels. Jellyfish themselves do not require light for health (moon jellyfish lack photosynthetic symbionts), so lighting is purely aesthetic. Avoid intense white light, which washes out their ethereal appearance. Cool blue tones make their bells glow and highlight the fine texture of their oral arms.

Maintenance Routine

Perform 10-20 percent water changes twice weekly using pre-mixed saltwater matched to the tank’s temperature and salinity. Clean the drain screen daily to prevent clogs. Test ammonia, nitrite and salinity at every water change. Jellyfish produce minimal bioload individually, but their food decomposes quickly in warm water, making frequent small changes more effective than large infrequent ones.

Is a Jellyfish Tank Right for You

Keeping jellyfish is a rewarding but specialised commitment. The equipment cost, including tank, chiller and food, typically runs $500-$1,500 for a small home setup in Singapore. Daily feeding and regular water changes are non-negotiable. If you are willing to invest the time and resources, few aquatic displays offer the same mesmerising visual impact. Gensou Aquascaping can advise on equipment selection and source healthy specimens through our network of marine suppliers.

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