Aquarium leaks are one of the most expensive failures in the hobby. These cover causes, prevention, and how Tank Commander warns you in time.

Most leaks come from a few sources: aged silicone seams, hairline cracks from impacts or stress, failed plumbing fittings, overflow boxes, or sumps that overflow during a power cycle. Even a small drip can soak floors and damage drywall before it’s noticed.

• → Read: A guide to aquarium leak detection

Silicone failure on older tanks, cracked bulkheads, kinked or detached return lines, overflows that siphon back during a power outage, and ATO pumps that stick on. Many of these are silent — you only notice when there’s already a puddle.

Look for damp areas around the stand, salt creep on the floor, or unexplained drops in tank level. The reliable answer is a leak sensor — it tells you before you notice anything.

Even a slow leak can cause thousands of dollars in flooring, drywall, and electrical damage, plus the obvious risk to fish. Catching it within minutes vs. hours is the difference between mopping up and replacing your floor.

Inside the stand on the lowest point of the cabinet, behind the tank where overflow boxes can spill, near the sump, and near any external pumps or RO/DI lines. The goal is to catch water at its first contact point.

Avoid placing sensors directly inside the sump (always wet) or somewhere that gets normal splash from skimmers or wavemakers. You want them dry by default so any water means a real problem.

A small water-detecting sensor lives where you choose. The moment it senses water, the controller sounds a local alarm on the device and pushes a notification to your phone — instantly, with no cloud round-trip required.

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Yes. The on-device alarm is loud enough to hear from the next room and works whether or not your internet is up.

Yes — push notifications are sent to every paired phone the moment a leak is detected. Multiple family members can be alerted at once.

Yes. You can build a rule that cuts power to specified outlets — return pump, ATO, top-off — the instant a leak is detected, stopping the source of water before more damage is done.

• → Read: Leak detection guide
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Cut power to pumps and the ATO, locate the source, and contain the spill. If the cause isn’t obvious, look at silicone seams, plumbing joints, and overflow plumbing first. Tank Commander can perform the pump shutoff automatically.

Yes. Sump baffles can crack, pumps and check valves fail, and RO/DI line connections can pop loose. Place sensors near every plumbing junction and external pump.

No — sensors detect liquid water making conductive contact, not humidity. Even a sweating cabinet won’t trigger them.

Yes. You can place several sensors around your stand, sump, and floor to monitor every risk point.

The sensors are passive and last for years. They have no batteries to replace. Wipe and dry occasionally as part of routine maintenance.

Yes — that’s the entire point. Catching a leak in the first minutes gives you time to cut pumps and contain the spill before it spreads beyond a few towels’ worth of water.

It can dramatically reduce the risk by cutting power to outlets when water reaches the cabinet floor. Combined with a properly wired GFCI, it’s a strong layered defense.

The sensor reacts within seconds of water contact. The local alarm and push notification fire essentially together, so you’re informed before water can spread far.

Yes — it’s designed to. If you place a sensor where it’s normally splashed (e.g. inside the sump or under a wavemaker), expect false positives. Choose a dry placement.

The local alarm always works. Push notifications need internet at least at one end; if your home Wi-Fi is down, alerts queue and deliver as soon as it’s back. The on-device alarm is your primary defense.