How To Set Up A Nano Reef Tank

1: Choosing your aquarium

Picking the right aquarium for your space and needs is a crucial first step. A large system of around 70-80L provides more stable water parameters and temperature, which makes them far easier for beginners. First, decide whether you want a coral-only reef or a mix of fish and corals, as this will affect the required tank size. A lot of the popular species require far more room than a nano tank can provide, so be sure to research the species before purchasing.

Some tanks come as kits with included equipment, but choosing one with an upgrade-ready design allows you to add or swap equipment such as protein skimmers or reactors. 

Location is also important to consider. We recommend situating your tank away from draughts, radiators, and direct sunlight to prevent temperature fluctuations and algae growth. You'll want to set up your aquarium somewhere it can be viewed and easily accessed for maintenance.

Shop our range of marine aquariums today to find the perfect miniature tank for your space.

2: Selecting the right marine lighting

Corals require bright, full-spectrum lights. A lot of modern reef spec LEDs provide the perfect illumination to support growth, without excess heat, that can be neatly installed over your nano tank. An open-top model makes it easy to clamp or suspend your preferred fixture.

Some aquarium kits come with LEDs included, but be sure to check it is upgradable if you want to keep corals.

We recommend looking at LEDs that have controllable blue channels to enhance colours, and be sure the light unit can be adjusted as your corals grow.

Check out our reef spec LED lighting range to find the right fit.

3: Maintaining a stable temperature

It's advised to keep your water at a steady 25°C. You'll need a heater to maintain the temperature, roughly 1 watt per litre of water. In summer months, you may even need a clip-on fan or a compact chiller to prevent overheating, depending on how warm your house gets.

Explore our heating and cooling options to keep consistent conditions.

4: Providing a strong water flow

Good circulation is key for preventing the build-up of debris, as well as delivering plenty of oxygen to your aquatic life. Most nano tanks feature a return pump, but adding a small wave maker helps you reduce dead spots and maintain a healthy flow of water.

5: Marine filtration

A thriving nano tank stems from mechanical, biological, and chemical filtration using the right filter and sump media and equipment. We recommend using:

• Filter sponge or wool: to trap debris particles
• Ceramic media: to house beneficial bacteria
• Activated carbon: to reduce water impurities
• Protein skimmer: add a skimmer to remove dissolved waste before it breaks down
• Phosphate remover: keep algae under control

6: Setting up and cycling your aquarium

Add substrate and live rock to aid biological filtration, then fill with mixed saltwater. Be sure to run the system with lights, pumps, and your heater for around four weeks whilst beneficial bacteria establishes. Use a water test kit to test ammonia, nitrite, and nitrate to check the cycle is complete before adding any fish.

At Swell UK, we have a range of marine salts, live rock, substrate, and even test kits, so you can get your aquarium cycled and ready.

7: Stocking your nano reef

Stock your aquarium slowly to avoid sudden spikes in the water quality. We recommend stocking in this order:

• Add your clean-up crew first. This can be snails, shrimp, small hermit crabs.
• Introduce hardy corals like zoanthids next.
• When your water parameters remain stable, add small reef-safe fish like clownfish or gobies.
• Avoid species that are too large for the tank, like tangs or large angelfish.

Browse our marine livestock range for inspiration today.

8: Feeding your fish

Feed your fish once or twice daily in small amounts. Try feeding with high-quality marine pellets, frozen, or live food. Corals may benefit from target feeding occasionally with species specific foods or phytoplankton. Remove uneaten food to prevent nutrient spikes.

9: Regular maintenance

Weekly

• Test key parameters (salinity, nitrate, and phosphate)
• Replace or rinse filter floss
• Carry out a 10-15% water change with pre-mixed saltwater

Monthly

• Replace activated carbon and phosphate media
• Inspect pumps and protein skimmer and clean as needed

Seasonally

• Check heater accuracy
• Clean wavemaker impellers

Ready to set up your nano tank?

With the right equipment and care routine, a nano reef can be a vibrant addition to your home. By carefully following each step, you can easily create a stunning miniature reef, complete with corals and fish.

Browse our marine collection and start building a miniature ocean today!