Reef tank setup

Setting up a reef tank is a sequence, and following it is what keeps the first months calm. Build the system, cycle it, add animals slowly, and let the tank mature before you add demanding corals. This is a practical, start-to-finish walkthrough of the decisions along the way.

Plan the tank before you buy

Decide where the tank will live, what size you can maintain, and whether you want a sump. A larger volume of water changes more slowly than a small one, which makes stability easier, but it also costs more to fill and light. A fish-only or FOWLR system is simpler than a full reef; if you are new to marine tanks, the saltwater aquarium for beginners guide is the place to start.

Step 1: tank, stand and placement

Put the tank on a stand rated for the filled weight, level and away from strong direct sunlight that drives algae. Leave room for maintenance and for the equipment you will add.

Step 2: rock and sand

Live rock is the biological heart of most reef tanks and the base for the aquascape. Cured live rock already carries the bacteria that process waste. Build an open structure with caves and ledges rather than a solid wall, so water can move through it and corals have places to sit. Add sand if you want a sandbed, then settle the rock so it cannot topple.

Step 3: water and salt

Fill with purified water, then mix in a marine salt to match natural seawater. Mix the salt thoroughly before it goes in the tank, and use a refractometer to confirm the salinity rather than guessing. Bring the tank up to a stable tropical temperature with the heater.

Step 4: flow and filtration

Start the pumps and create movement around the rock. A protein skimmer removes dissolved waste before it breaks down. Confirm the return and drainage, if you have a sump, are working without leaks or noise before you add anything living.

Step 5: cycle the tank

Let the tank cycle. This is the period when the bacteria that process waste establish themselves on the rock and in the filter. Test through the cycle and wait until the water has settled before adding livestock. Do not rush this step by adding fish early.

Keep a simple log of what you add and what you test. A written record turns a confusing water problem into a pattern you can see.

Step 6: cleanup crew, then fish

Once the tank has cycled, a cleanup crew of snails and other grazers can help keep surfaces tidy. After that, add fish slowly, giving the system time to adjust to each addition. Quarantine new fish where you can, and feed lightly.

Step 7: corals and lighting

Let the tank run and stabilise before adding corals. Start with hardy varieties from the beginner corals guide, and set lighting to suit the corals you keep rather than running it at maximum. Acclimatise new corals to your light. As the tank matures you can move toward LPS and, eventually, SPS corals.

Finding equipment and livestock in Canada

Reef tank setup: common questions

How do I set up a reef tank step by step?

Choose the tank and stand, add live rock and sand, fill with purified water and mix in marine salt, start the pumps and heater, then cycle the tank. Add cleanup crew, then fish, then corals, a few at a time once the tank is stable.

How long does a reef tank take to set up?

The physical setup is quick, but the tank must cycle before it can support livestock, and it matures further over the following weeks. Plan on waiting through the cycle rather than stocking on day one.

What do I need for a reef tank?

A tank and stand, live rock and sand, purified water and marine salt mix, a heater, pumps for flow, filtration such as a protein skimmer, reef-capable lighting, and test kits. A sump is optional but adds volume and hides equipment.

Can I use tap water in a reef tank?

It is better to avoid it. Tap water can contain minerals, chlorine or contaminants that cause algae and coral problems. Purified water, such as reverse-osmosis water, gives you a clean starting point.

Where do I buy reef tank equipment and livestock in Canada?

A reef-focused aquarium store will stock marine rock, salt mix, test kits, lighting and livestock together. Browse the Rainforest Reef directory by province and city, and check which stores carry saltwater and coral.

Keep reading

General information only. Equipment and livestock availability vary by store; confirm details locally.