Start with a humble 20-gallon nano tank. Master real saltwater chemistry, grow coral, breed fish — and build your way up to a 1,000-gallon Atrium with your very own shark.
Every fish, coral and upgrade gets you closer. Fund the climb, keep your reef alive, and chase holy-grail livestock — all the way to the coveted Epaulette Shark, the rarest trophy in the reef.
A real, fully-grown Reef Simulator tank — running live, right here in your browser.
▶ BUILD YOUR OWNReef Simulator runs on the same parameters real reefers obsess over. Let them drift and corals bleach, fish stress, and algae takes over. Keep them dialed in — dose, test, run water changes — and your reef doesn't just survive, it thrives into a glowing showpiece.
Every choice has consequences. It's a genuine reef-keeping challenge — survive first, then thrive.
Reef Simulator models the real hobby — the chemistry, the growth, the heartbreak, and the payoff. Get it right and your tank becomes a glowing showpiece.
Balance salinity, pH, alkalinity, calcium, nitrate & phosphate. Let them drift and your reef pays the price.
Nurture colonies from tiny frags to showpiece heads, then frag them for profit and rare colour morphs.
Pair up clownfish, hatch fry, and unlock rare designer strains the more you tend your tank.
Switch on actinic blue & UV light and watch your corals glow — husbandry you can actually see.
Capture a branded shot of your reef in one click and show it off.
A weekly reef critic grades your tank F→S, and the clock is running — race the fastest times to upgrade.
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