Moving an aquarium

An established tank is the most awkward thing in the house to move. It is heavy, it is fragile in a way that is easy to underestimate, everything living in it depends on a filter that is about to be switched off, and if you are crossing a state border it may not be legally yours to take. None of that makes it hard, but it does make it a job to plan rather than improvise on the day. This guide covers the order to do things in, the thing almost nobody anticipates about moving interstate, and why the water coming out of the tap at the new place may be nothing like the water your fish are used to.

Published 16 October 2026 · Last updated 16 October 2026 · 11 min read

Crossing a state border

Deal with this first, because it is the only part that can stop the move outright, and because the approvals take time.

Nothing about loading your own tank into your own truck feels like importing livestock, but several states regulate the movement of live fish in its own right. An established, entirely legal tank can become a permit question the moment it crosses a state line. Two jurisdictions need checking before anything else.

Tasmania

Tasmania answers this question directly, and the answer has three steps rather than one. First, check the Inland Fisheries Service permissible imports list: species not on that list cannot come into Tasmania at all. Second, even for species that are on it, you still need an exemption permit, which carries a fee and which the Service considers on biosecurity and compassionate grounds. Third, and this is the part worth reading twice: the Service warns that even with an exemption permit issued by the Director of Inland Fisheries, freshwater aquarium fish may still be seized at the border by Biosecurity Tasmania, which runs its own separate requirements for live fish imports.

Where to check: the Inland Fisheries Service freshwater aquarium fish page, which has the permissible imports list and the exemption permit application.

Western Australia

Western Australia treats bringing live fish into the state as translocation, and states plainly that you need authority to import into or move fish within Western Australia. Approvals come in tiers: an automated approval issued immediately online for certain listed purposes and whitelisted species, a streamlined approval that goes to the department's translocation officer and can take up to ten days, a standard approval where you fall outside those categories, and a full translocation authority for complex or higher-risk cases. The department's guidance does not address aquarium fish by name, and directs aquarium queries to its translocation officer to confirm which approval applies.

One detail matters especially for a planted tank: on arrival, live fish are inspected for pests and diseases and must be free of aquatic snails and non-permitted plants. If your tank has a snail population, which most established planted tanks do, that is a problem to solve before you travel rather than at the border.

Where to check: WA DPIRD's importing and keeping live fish (translocation) page.

Everywhere else

Other states and territories vary, and the species you keep matters as much as the border you cross, because a fish that is unrestricted where you live can be noxious where you are going. Our guide to aquarium fish laws in Australia lists every jurisdiction's authority with links, and the rule of thumb is to contact the destination state before moving day, not your current one.

Your water will change

This is the part people do not see coming, and it is where an otherwise smooth move goes wrong a fortnight later.

Australian tap water varies enormously between cities, and not in the direction most people assume. Moving from Melbourne, by a wide margin the softest capital, to the limestone belt north of Perth takes you from roughly 1 dGH to around 12.8 dGH, close to the full national range in one move. The figures below come from the utilities' own reporting and are covered in detail in our water parameters guide.

The fix is patience rather than chemistry. Refill with as much of your old tank water as you can carry, then let the new water take over gradually through normal weekly water changes over the following month or two. That gives the fish weeks to adjust rather than minutes. If the gap is large enough that your species genuinely will not suit the new water, our guide to adjusting water parameters covers what can reasonably be changed and what cannot, and the hardness converter will translate whatever units your new utility reports in.

Before moving day

• Settle the interstate approvals, if they apply. Weeks, not days.
• Gather containers. Food-grade buckets with lids are the workhorse: they carry fish, they carry old tank water, and they carry substrate. You will want more than you think.
• Borrow or buy a battery air pump if the trip is more than an hour or two. It is the same piece of kit that saves a tank in a blackout, for the same reason, and our power outage guide explains why oxygen is the thing that runs out first.
• Do a water change a few days beforehand, not on the day. You want the fish going into the move in clean water and settled, not freshly disturbed.
• Feed normally until the day before, then stop. A fish with an empty gut fouls its transport water far less.
• Decide where the tank is going at the new place, and check the floor is level and the stand is sound, before anything is carried in.

Moving day, in order

The sequence matters, because each step depends on the one before it. Fish come out first and go in last.

1. Catch the fish into bags or lidded buckets of their own tank water, and set them somewhere dark, insulated and out of the way.
2. Save tank water. Fill as many buckets as you can carry. This is the single cheapest thing you can do to make the other end easier.
3. Lift the filter media straight into a bucket of tank water and keep it submerged for the whole journey. Media that dries out is the colony you actually lose.
4. Remove plants and decor. Plants travel well in a bag or tub with a little water, kept damp and out of the sun.
5. Bag the substrate. It is heavier than it looks, so split it across several containers rather than one.
6. Drain the tank completely, then sponge out what is left. Completely means completely.
7. Move the empty tank, carried from underneath by its base, never by its rim or its bracing.

Transporting the fish

The priorities are the same as in a blackout, and for the same reasons: oxygen first, stable temperature second.

• Do not overcrowd. Fewer fish per container, more containers. Large or spiny fish travel better individually.
• Keep them dark. A lid, or a towel over a bucket, calms fish considerably and reduces how hard they breathe.
• Insulate rather than heat. A bucket inside an esky, or wrapped in a blanket, holds temperature far better than anything you can add, and a slow drift is harmless where a fast swing is not.
• Aerate on a long trip. A battery air pump and an airstone in each bucket, or at minimum opening the lids periodically and stirring the surface.
• Do not feed at any point during the move.
• Keep them in the car with you if you can, not in the back of a hot truck. Moving vans are not temperature controlled.

If the move involves a flight, a courier, or an interstate freight company, the carrier sets its own rules for live animals and they vary between operators. Ask them directly, well in advance, and get the answer in writing rather than assuming it can be sorted at the depot.

Setting up, and the fortnight after

Set the tank up completely before a single fish goes back in.

1. Position the empty tank, check it is level, and confirm the stand is solid.
2. Substrate, then decor and plants. Our substrate guide covers depth if you are changing anything while you have the chance.
3. Fill with your saved tank water first, then top up with new water, dechlorinated for the disinfectant your new city actually uses. The water conditioner calculator works out the dose.
4. Reinstall the filter with its original wet media, and run it. If it has been sitting long enough to smell sour or stale, rinse the media in tank water before starting it rather than pumping that straight into the tank.
5. Get the heater running and let the tank come up to temperature on its own before the fish go in.
6. Return the fish, floating or drip-acclimatising them to the tank temperature as you would new arrivals.

Then treat the next couple of weeks as a tank that has had a shock, because it has. The filter lost some of its colony, the substrate was disturbed, and the water chemistry may be drifting towards a new normal.

• Test ammonia and nitrite daily for a week or two. The API Freshwater Master Test Kit is the standard choice.
• Feed lightly, and not at all for the first day. A reduced filter cannot process a full feed.
• Dose Seachem Prime if ammonia or nitrite appears, which buys time while the colony rebuilds.
• Hold off on new fish until readings have been clean for a fortnight. If the readings behave like a tank with no filter at all, treat it as a partial recycle and follow our cycling guide.

Done properly, a house move costs an established tank a week or two of slightly elevated vigilance and nothing else. The losses almost always trace back to one of three things: a tank lifted with water in it, filter media allowed to dry out, or an interstate approval nobody checked until the truck was loaded.

Related reading: aquarium fish laws in Australia, state by state, what to do when the power goes out, and aquarium water parameters, or browse the species directory.