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Key takeaways
- A reef tank needs a tank, filtration, reef lighting, flow, a heater, rock and sand, quality reef salt, RO/DI water and test kits.
- Cycling a new marine aquarium usually takes around 4–8 weeks. Don't add livestock until ammonia and nitrite read zero.
- Start with hardy fish and soft corals, then add livestock slowly over months, not days.
- Stability is everything. Test regularly, change water routinely and top up with RO/DI water.
Setting up a marine reef tank in New Zealand is a rewarding project. With good planning and the right equipment, you can build a thriving piece of living ocean at home. This guide walks you through the equipment, the set-up steps, cycling, your first livestock and the mistakes to avoid.
What do I need to start a marine reef tank in NZ?
| Equipment | Why you need it |
|---|---|
| Aquarium (ideally with a sump) | A larger volume of water is more stable. All-in-one reef systems simplify set-up. |
| Reef lighting | Corals need quality light for photosynthesis. See our lighting guide. |
| Protein skimmer and filter media | These remove organic waste before it breaks down. |
| Wavemakers and a return pump | They provide flow for oxygen, food delivery and waste removal. |
| Heater (and a chiller in warm rooms) | They hold a steady temperature of 25–26 °C. |
| Reef rock and sand | These provide surface area for beneficial bacteria and form your aquascape. |
| Reef salt and an RO/DI unit | Pure water and quality salt give you consistent, clean saltwater. |
| Test kits and a refractometer | Use them to track salinity, ammonia, nitrite, nitrate, alkalinity, calcium and more. |
Step-by-step set-up
- Choose the location. Pick a level, sturdy floor away from direct sun and draughts, with power nearby. Water is heavy: every litre weighs about 1 kg.
- Install the tank, stand and plumbing, then leak-test with fresh water.
- Aquascape your rock. Build stable, open structures with good flow paths and room for corals.
- Mix saltwater using RO/DI water to about 35 ppt. Follow our guide on how to mix saltwater for a reef tank.
- Add sand, fill and start the equipment. Run pumps, the heater and the skimmer, and check the temperature.
- Cycle the tank (see below).
- Add your first livestock slowly, starting with a clean-up crew and one or two hardy fish.
Which reef salt is best for beginners in NZ?
A consistent, well-known reef salt makes life easier. Red Sea Coral Pro and Fauna Marin Professional Sea Salt are both popular choices. Compare the Red Sea options in Red Sea Reef Salt vs Coral Pro.
How long does it take to cycle a marine aquarium?
Cycling grows the beneficial bacteria that convert toxic ammonia to nitrite, and then to nitrate. It typically takes 4–8 weeks. Add an ammonia source and bottled bacteria if you like, then test regularly. The cycle is complete when ammonia and nitrite both read zero and nitrate is present. Our water testing guide explains what to test and when.
What are the easiest corals and fish for beginners?
Soft corals such as zoanthids, mushrooms and leathers are hardy and forgiving. Duncans and hammers are good first LPS corals. Read coral care for beginners. For fish, start with hardy, peaceful species such as clownfish, chromis and blennies and gobies. See our 10 best saltwater fish.
A typical first-year timeline
| Time | Milestone |
|---|---|
| Weeks 1–8 | Set-up and cycling; expect diatoms and early algae |
| Months 2–3 | Clean-up crew, first hardy fish and a few soft corals |
| Months 3–6 | Add fish slowly and introduce easy LPS corals |
| Months 6–12 | A stable, maturing reef; consider more demanding corals once alkalinity and nutrients are consistently stable |
Common beginner mistakes
- Adding fish before the cycle is complete.
- Using tap water instead of RO/DI water.
- Adding too many fish at once.
- Chasing numbers with too many additives instead of aiming for stability.
- Skipping quarantine and acclimation. See our fish acclimation guide.
- Overfeeding, which fuels algae.
Planning your first reef?
Browse our marine aquariums and Red Sea reef systems, or visit us at 114 Wiri Station Road, Wiri, Auckland for advice on equipment and livestock.
Frequently asked questions
What do I need to start a marine reef tank in NZ?
You will need a tank, filtration (ideally a protein skimmer), reef lighting, wavemakers, a heater, rock and sand, reef salt, RO/DI water and test kits.
How much does a reef tank cost in New Zealand?
It depends on tank size and equipment choices. A nano system costs far less than a large sump-based reef. Talk to us about your budget and we'll help you plan.
How long does it take to cycle a marine aquarium?
Usually around 4–8 weeks. Test ammonia and nitrite until both read zero.
Can I use tap water in a reef tank?
We recommend RO/DI water. Tap water can contain phosphate, nitrate, silicates and metals that fuel algae and harm corals.
