The Gear List for a Silent Aquarium Build in a Brisbane Apartment

A reader messaged us last month with a familiar problem. He'd just moved into a New Farm apartment with polished timber floors and a downstairs neighbour who works night shifts. He wanted a 300 litre reef in the lounge room, but every sump setup he researched sounded like it belonged in a plant room, not next to the couch. That's the brief we get more often now: build something that looks good and disappears sound-wise. Here's the gear list we'd actually put together for that exact situation.

Noise in a reef or planted tank almost never comes from one culprit. It's a stack of small vibrations, a pump humming against glass, a wavemaker ticking on its magnet, water splashing through an overflow, plumbing rattling against a cabinet wall. Fix each layer and the whole system drops to a level you genuinely have to lean in to hear.

The scenario

Apartment living room, concrete slab floor, timber cabinetry, tank viewable from the dining table. No garage or spare room to hide a loud sump. The owner wants to watch TV at normal volume with the filtration running in the same room. That rules out anything with a AC induction pump slapping away at 50Hz mains hum, and it rules out loose plumbing that transmits vibration into the cabinet like a drum skin.

The build

• DC return pump. This is the single biggest lever. A quality DC return pump uses a brushless motor and runs at a fraction of the vibration of an old AC pump. Look in our Sicce range for models built around silent-running impellers, they're a standard choice for apartment builds because they idle almost silently even at higher flow settings.
• Controllable wavemaker. Magnetic wavemakers can tick if the magnet drive isn't seated well or if flow is set too aggressively for the pump's sweet spot. Browse the wavemaker range and pick a model with a wide flow curve so you can run it at 40 to 60 percent instead of maxing it out, that alone removes most of the clicking noise people complain about.
• Soft-start plumbing and unions. Rigid PVC glued straight to a cabinet wall carries vibration like a tuning fork. Use flexible tubing sections at pump inlet and outlet, and rubber-lined clamps rather than hard mounts. Check plumbing fittings for unions and flex hose that let you isolate the pump from the structure of the cabinet.
• Filter sock or sponge pre-filter on the overflow. A chattering overflow is often just water falling too fast into a shallow sump chamber. Slowing the fall with a sock, and keeping the water level in the sump higher, quiets the splash considerably.
• Foam pump feet or a rubber mounting mat under the sump. This is a five dollar fix that gets skipped constantly. Any hum that does exist gets absorbed by the mat instead of transmitted into the cabinet base and floor.
• Controller with quiet-hours scheduling. An Apex or similar controller lets you drop return flow and wavemaker output automatically overnight, useful if the downstairs neighbour is on shift work and quiet after 10pm actually matters.
• Aeration handled through the return, not a bubbling airstone. Airstones are cheap but they hiss. If oxygenation is a concern, a well-surfaced sump or a controlled skimmer from the aeration collection does the job without the fizzing sound sitting under everything else.

Before and after

Before: an AC pump running flat out at max flow, a wavemaker ticking every two seconds, plumbing glued rigid to the cabinet, and an overflow splashing into a half empty sump. Total effect, a low but constant background hum you can hear from the kitchen.

After: DC return pump idling at 70 percent with a brushless motor, wavemaker dialled back and mounted with a properly seated magnet, flexible unions absorbing vibration before it reaches the cabinet, sump water level raised to soften the overflow, and a foam mat under the whole chamber. Most owners tell us they can only hear the tank if they put an ear near the cabinet door.

A few extra details that matter

Pump placement inside the cabinet matters as much as the pump itself. Pushing it hard against a cabinet wall or corner amplifies any residual hum through that panel like a speaker box. Leave a few centimetres of clearance and let the rubber feet do their job. Cable ties and loom clips stop power cords from buzzing against glass too, another small noise source people forget until it's driving them mad at 11pm.

If you're running a chiller or a cooling fan for a Brisbane summer, that's a separate noise consideration entirely. Compressor-based chillers are noisier than fans, so if the tank sits in a lounge room, check the cooling range for fan-based options first and only step up to a chiller if fan cooling can't keep pace with QLD heat.

What this costs in real terms

A DC return pump suited to a 300 litre reef generally sits in the 250 to 450 AUD range depending on flow rating and brand. A quality wavemaker with a wide adjustable curve runs from around 150 to 350 AUD. Flexible plumbing kits and rubber isolation mounts are inexpensive, usually under 50 AUD all up, and they make a disproportionate difference for the price. None of this needs to be top shelf gear, it needs to be the right gear chosen for a quiet outcome rather than raw flow numbers on a spec sheet.

FAQ

Will a DC pump really fix most of the noise?
It fixes the biggest single source, motor vibration. Combined with proper mounting and flexible plumbing, it usually solves 80 percent of the problem on its own.

Can I retrofit an existing loud sump without rebuilding it?
Yes. Swap the return pump, add rubber isolation under the sump, and replace rigid unions with flexible sections at the pump connections. Most of the noise reduction comes from these three changes.

Does raising sump water level actually reduce sound?
It does, because it shortens the fall distance for water coming through the overflow, which is often the loudest single noise in a system that otherwise runs quiet pumps.

Prices mentioned above are accurate at the time of publishing and are subject to change. Please check the relevant product or collection page for current pricing before making a decision.