Beginner reef setup
14 min read
Reefing is more forgiving than it used to be — if you start with the right equipment and respect cycling. Here's the modern, no-nonsense path.
Pick a tank: AIO is your friend
All-in-one tanks like the Waterbox AIO 20, IM Nuvo Fusion, or Red Sea Reefer Nano hide your equipment and simplify plumbing. Start at 20–40 gallons — small enough to be affordable, big enough to be stable.
Essential equipment
Dalua reef LED rated for your tank size (also Kessil A80, AI Prime 16HD). Dalua powerhead for flow (10–20x turnover). Heater. Refractometer (not a hydrometer). Salt mix (Tropic Marin, Red Sea, Instant Ocean Reef Crystals). RO/DI water — never tap.
Auto top-off (strongly recommended)
Use an auto top-off (ATO) to keep salinity stable at all times. Evaporation concentrates salt; topping off manually every day is easy to forget, and salinity swings can stress or kill corals. An ATO adds fresh RO/DI water automatically as the tank evaporates and is one of the best investments for a beginner reef.
Live rock and sand
10–15 lbs of dry or live rock and 1 inch of fine reef sand. Aquascape OUT OF the tank first. Use reef cement or epoxy to create stable, open structures with caves and overhangs.
Mix, cycle, and wait
Mix salt to 1.025 sg in a separate container, then transfer to the tank. Cycle for 30 days. Lights off the first 2 weeks to reduce diatoms. Add a few snails and hermits at week 4 — they're your CUC (clean-up crew).
First coral and first fish
Week 6: add a soft coral (Xenia, Zoa, Kenya Tree) and one small fish (a clownfish or a goby). Watch for 2 weeks. Add slowly.
Weekly routine
10% water change. Test alkalinity (target 8–9 dKH) and salinity. Top off freshwater daily to replace evaporation. Skim or clean the filter floss. Spot-feed corals 1–2x/week.