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An aquarium is a small closed ecosystem sitting on your floor, and the three things that make it succeed or fail are all invisible: biological filtration, water chemistry and temperature stability. People who buy a tank, fill it and add fish the same afternoon lose those fish, and they lose them for reasons that have nothing to do with the equipment they spent their money on.

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In Australia there is a further dimension that aquarium hobbyists elsewhere do not face in the same way. The tank is a biosecurity container. Queensland law under the Biosecurity Act 2014 identifies prohibited noxious fish, which are not in the state and are not permitted to be brought in and must be reported to Biosecurity Queensland within 24 hours if sighted, and restricted noxious fish, which you must not move, give away, sell or release into the environment. The state government describes a general biosecurity obligation to take all reasonable and practical measures under your control to minimise the risks associated with invasive fish.

The practical rule is simple and absolute: nothing from your tank goes into a drain, a creek or a garden pond. Not a fish, not a plant fragment, not the water. That is the line between a hobby and an incident, and it is enforceable.

Tank types and what each one commits you to

  • A coldwater tank needs no heater, which sounds easy until an Australian summer pushes a room past the range the fish tolerate and you need a chiller instead.
  • A tropical freshwater tank is the standard beginner setup and the most forgiving, provided the filter is mature before the fish arrive.
  • A planted aquascape adds lighting, carbon dioxide and substrate chemistry, and becomes a horticultural project as much as an aquatic one.
  • A marine fish-only tank needs salinity control and far more stable temperature than freshwater, and mistakes are less recoverable.
  • A reef tank with corals is the most demanding domestic aquarium there is: lighting, flow, calcium, alkalinity and trace elements all matter.
  • A very large tank stops being furniture and becomes a structural and plumbing consideration, which is where an installer earns their fee.

What you may keep, and what you must never release

Queensland's guidance on invasive freshwater animals divides the problem in two. Prohibited noxious fish are species that are not in Queensland and are not able to be brought into Queensland; a sighting has to be reported to Biosecurity Queensland within 24 hours. Restricted noxious fish are species already present, and for several of them the state is explicit that you must not move these fish, give them away, sell them or release them into the environment.

For the catchable restricted species — carp, Chinese weatherfish, climbing perch, gambusia and tilapia among them — the instruction goes further: you must immediately humanely kill them and dispose of them responsibly away from the water body, and you must not use them for bait. The general biosecurity obligation requires you to take all reasonable and practical measures under your control to minimise the risks.

Lists and categories differ between states and territories, and a species that is an unremarkable pet shop fish in one jurisdiction can be a declared pest in another. If you are moving interstate with a tank, check before you pack it, not after.

Cycling the tank before the fish arrive

A new aquarium has no biological filter. Fish produce ammonia, which is toxic; bacteria that consume ammonia and produce nitrite have to colonise the filter media first, and a second population that converts nitrite to the much less toxic nitrate has to follow them. Until both populations are established, the tank cannot process waste, and fish added in that window are poisoned by their own output. This is the single most common reason a first aquarium fails, and it is entirely avoidable.

Establishing that filter takes weeks rather than days, and it is done by adding a source of ammonia and testing until ammonia and nitrite both read zero while nitrate rises. Seeding the new filter with media from an established, healthy tank shortens it considerably. The discipline that matters afterwards is stocking slowly: each new addition increases the load and the bacterial population takes time to catch up.

Weight, floors and where a large tank can actually go

  • Water is heavy, and a filled aquarium plus substrate, rock and cabinet concentrates that weight over a small footprint.
  • On a concrete slab the load is rarely the issue; on a suspended timber floor in an older house it can be, particularly mid-span rather than near a wall.
  • Get advice from a structural engineer before installing a large tank on a suspended floor or on an upper storey, rather than after the cabinet is in place.
  • Position the tank out of direct sun: an Australian window will drive both algae growth and a temperature swing the heater cannot correct.
  • Leave real access behind and above the tank, because every maintenance task you cannot reach is a task that will not get done.
  • Plan for water on the floor. A tank near carpet, near a stair, or above a room you care about is a tank that needs a tray and a plan.

Electricity, water and the equipment that runs continuously

An aquarium runs heaters, pumps, lights and often a chiller twenty-four hours a day, immediately next to a large volume of water. The NSW Government's home electrical safety advice states the principle directly — do not mix electricity and water — and describes safety switches as devices that cut the supply to protect against serious electric shock, injury or death and help prevent electrical fires. It also warns against overloading power points and power boards, which is exactly the failure mode a tank full of equipment invites.

Have a licensed electrician install a properly protected outlet where the tank will live rather than running a board off an existing point. Electrical wiring work is licensed in every Australian state and territory whatever its size, and in New South Wales the electrician must give Building Commission NSW a Certificate of Compliance for Electrical Work. Form a drip loop in every lead so water running down a cable drips off before it reaches the plug, and switch equipment off at the wall before putting your hands in the tank.

The routine that keeps a tank stable

  • Partial water changes on a regular schedule, dechlorinating and temperature-matching the replacement water before it goes in.
  • Rinsing filter media in tank water rather than tap water, so you do not kill the bacteria the filter exists to house.
  • Testing ammonia, nitrite, nitrate and pH, and testing more often after any change to stocking, feeding or equipment.
  • Feeding less than feels generous; uneaten food is the most common cause of a water quality crash in a home aquarium.
  • Checking the heater against an independent thermometer, because a failed heater stuck on is more dangerous than one stuck off.
  • Disposing of old tank water onto the garden or down the household sewer, never into a stormwater drain, a creek or a garden pond.

Aquariums: frequently asked questions

Can I release an unwanted aquarium fish into a creek or a pond?

No, and in Queensland it can be an offence. The state's guidance on invasive freshwater animals says that for several restricted noxious fish you must not move them, give them away, sell them or release them into the environment, and that a general biosecurity obligation requires you to take all reasonable and practical measures under your control to minimise the risks associated with invasive fish. Prohibited species must be reported to Biosecurity Queensland within 24 hours of a sighting. Beyond the legal position, released aquarium species have established populations in Australian waterways that have proved effectively impossible to remove.

Why did my fish die in the first two weeks?

Almost always because the tank had not cycled. A new aquarium has no established bacterial filter, so the ammonia the fish produce has nothing to process it, and the nitrite that follows is toxic too. Both populations need weeks to establish. Cycle the tank first by adding a source of ammonia and testing until ammonia and nitrite read zero while nitrate rises, or seed the filter with media from a healthy established tank, and then add fish slowly rather than all at once.

Do I need to check whether a species is legal where I live?

Yes, because the lists are made by each state and territory and they are not the same. A fish sold routinely in one jurisdiction can be a declared pest in another, and Queensland maintains separate prohibited and restricted noxious fish categories under the Biosecurity Act 2014 with different obligations attached to each. Check your own state's list before buying, and check again before moving interstate with a tank.

Will a large aquarium damage my floor?

It can, because a filled tank concentrates a lot of weight over a small footprint. On a concrete slab that is rarely a concern. On a suspended timber floor, particularly mid-span in an older house or on an upper storey, it is worth getting a structural engineer's view before the tank is filled rather than afterwards. It is also worth planning for the water getting out: a tray under the cabinet and a considered position relative to carpet and stairs will save you more than it costs.

How do I dispose of old tank water safely?

Onto the garden or into the household sewer, and never into a stormwater drain, a creek or an outdoor pond. Tank water can carry plant fragments, snails, eggs and pathogens, and stormwater in most Australian suburbs runs untreated to a waterway. The same rule applies to gravel, plants and filter media you are getting rid of: dry them out and put them in the bin rather than rinsing them outside.

Sources

  1. Queensland Government: Your legal obligation for invasive freshwater animals
  2. NSW Government: Electrical safety at home
  3. NSW Government: Electrical compliance requirements (CCEW)

Written by the LokalMatch editorial team. Last reviewed 22 September 2026. How we write and check our guides

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What affects the cost of aquarium

Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:

  • Size and scope of the job
  • Materials and finishes chosen
  • Condition of what's there now
  • Access to the work area
  • Urgency and scheduling
  • Permits, where required

How to compare aquarium specialists before you hire

  • Describe the job clearly, with photos if you can, so pros can give you a realistic quote.
  • Get more than one written quote and compare them on the same scope of work.
  • Check that the pro carries liability insurance and, where required, is licensed for this work in your area.
  • Look at recent reviews and photos of similar jobs.
  • Get the price, the timeline and the payment terms in writing before work starts.

Questions to ask aquarium specialists before you hire

  • Have you done jobs like this before, and can I see examples?
  • What is included in your price, and what isn't?
  • Does this work need a permit from my municipality, and who will get it?
  • Can you show me proof of liability insurance?
  • When can you start, and how long will the job take?
  • What warranty or guarantee do you offer on your work?

Aquarium permits and local rules

Some aquarium work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.

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