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A large aquarium is unusual furniture. Filled with water, rock and gravel, it can outweigh almost anything else in the room, and it puts pumps, heaters and lights beside open water. Big and built-in tanks therefore call for a check of the floor structure and a protected electrical supply installed by a licensed electrician. The fish and plants carry a responsibility of their own: they must never end up in a local pond, stream or storm drain.
This page covers aquarium services, floor loading, electrical safety, cycling and water changes, warning signs, what to do with unwanted fish and plants, and moving an established tank.
Aquarium installation and maintenance services for homes
- Custom installation: the specialist helps size and place the tank, sets up the stand, filtration, heating and lighting, starts the system and explains the routine care.
- Built-in and in-wall aquariums: the tank sits in a framed opening with a service area behind or above it, usually built by a carpenter to the specialist's plan.
- Saltwater and reef systems: more equipment, such as a sump and skimmer, and much closer monitoring of water chemistry.
- Maintenance plans: visits on a set schedule for water testing, partial water changes, glass and filter cleaning and an equipment check.
- Moves and teardowns: relocating an established tank, or taking one down and rehoming its fish and plants responsibly.
Floor load for large aquariums: stands, joists and when to call an engineer
Water is heavy, and an aquarium concentrates that weight on the small footprint of its stand, often for years. A small tank on sturdy furniture is rarely a concern, but a large display tank, a tank with a sump underneath or several tanks in one room is a very different load from the sofa and bookcases a floor was designed around. Wood framing can sag slowly under a heavy load, and even slight movement stresses the tank's seams.
Before a large tank goes in, especially on an upper floor, have a structural engineer, or a contractor working with one, look at the joists: which way they run, their span and condition, what supports them below and whether reinforcement is needed. A basement slab usually handles a big tank more easily, though it still has to be flat.
- Use a stand built for the tank's size and full weight, never a dresser or shelf that wasn't designed for it.
- Set the stand level and fully supported, following the tank maker's instructions on levelling and pads, since an uneven base strains the glass.
- Leave room around and above the tank for maintenance, and keep it out of direct sun and away from heating vents.
- Built-in tanks need framing designed for the load and ventilation for the humidity and heat the equipment gives off.
Aquarium electrical safety: GFCI protection, drip loops and licensed wiring
Every aquarium puts heaters, pumps and lights within reach of water that someone puts their hands into every week. The Electrical Safety Authority recommends ground fault circuit interrupters (GFCIs), which cut the power when current leaks to ground, for outdoor circuits around water and in kitchens and bathrooms, and an aquarium brings the same risk into the living room. ESA also calls extension cords a temporary solution and advises having a Licensed Electrical Contractor install permanent wiring and outlets. In Ontario that contractor notifies ESA of the work; in Quebec, electrical contractors hold a licence through the CMEQ.
- Let each cord dip below the level of its outlet in a drip loop, so water running down the cord falls off before it reaches the plug.
- Unplug heaters, pumps and lights before reaching into the tank or starting a water change.
- If a GFCI trips repeatedly, treat it as a warning of a leaking heater or damaged cord and call an electrician, never move the plug to an unprotected outlet.
- New circuits, outlets inside a built-in cabinet and wiring for a fish room are jobs for a licensed electrician, not the aquarium installer.
Cycling a new aquarium and routine partial water changes
A new tank isn't ready for fish the day it's filled. Fish give off ammonia, which is toxic to them, and it takes time for beneficial bacteria to colonize the filter and convert it to nitrite, then to less harmful nitrate. Managing this cycling period, and adding fish a few at a time once tests show the bacteria can keep up, is a large part of what you pay a specialist to get right.
In an established tank, nitrate and dissolved waste build up slowly, and partial water changes remove them. How much water to change and how often depends on the tank's size, how many fish it holds, how much they're fed and whether it is fresh or salt water, so the schedule should follow water tests rather than a fixed rule.
- Treat tap water with a conditioner before it goes into the tank, since the chlorine or chloramine used to disinfect municipal water harms fish.
- Match the new water's temperature to the tank, and for saltwater, mix it ahead and check the salinity.
- Rinse filter media in water taken from the tank rather than under the tap, so the bacteria living in it survive.
- Feed sparingly, since uneaten food rots and drives up waste.
Signs your aquarium needs service: cloudy water, algae, gasping fish and leaks
- Cloudy or foul-smelling water, which can point to an overloaded filter, overfeeding or something decaying in the tank.
- Algae spreading faster than usual on the glass, rock or plants, often from too much light or too many nutrients.
- Fish gasping at the surface, hiding, or losing colour or appetite, which calls for an immediate water test.
- A heater that won't hold temperature, or a pump that has become louder, weaker or silent.
- Water on the floor, a damp stand or moisture along a seam; unplug the equipment first, then have the tank drained down and assessed quickly.
Never release aquarium fish or plants: the federal rule on invasive species
Fisheries and Oceans Canada warns that aquarium pets and water garden plants can become aquatic invasive species once they reach local waters, and that even small pieces and seeds of some plants can take hold and spread. Under the federal Aquatic Invasive Species Regulations, it is illegal to introduce an aquatic species into a body of water where it isn't native unless federal, provincial or territorial law authorizes it. Emptying a tank into a pond, a stream or a storm drain is never the answer.
- For fish you can no longer keep, the department suggests finding someone to adopt them or asking a pet store whether it will take them back.
- Where rehoming isn't possible, it points to humane euthanasia by a veterinarian, and it advises burying dead fish rather than flushing them.
- Unwanted non-native plants should be dried and frozen in a sealed bag, then put in the garbage rather than the compost.
- When a tank is taken down, ask your specialist to handle rehoming and disposal so nothing ends up outdoors.
Moving an established aquarium: relocate the system or restart it
A tank should never be moved with water in it, since the weight and the sloshing can crack the glass or open the seams. Moving one means catching the fish, keeping them and the filter bacteria alive in tank water while the system is drained, moved and set up again, then watching the water closely until it settles. For a long move, or delicate fish and corals, rehoming them and restarting in the new home can be the kinder option.
- Keep some existing water and the wet filter media in sealed containers, so the biological filter survives the trip.
- Check the new spot's floor, level and outlets before moving day, not after the tank arrives.
- Expect extra testing afterward, since stirred-up gravel and a stressed filter can cause a short spike in waste.
Aquariums: frequently asked questions
How long before I can add fish to a new tank?
Not until the tank has cycled, meaning the bacteria in the filter can handle the waste fish produce. The time varies with the setup and method, so your specialist decides from water tests, then adds fish gradually.
How often does an aquarium need professional maintenance?
It depends on the size, stocking and type of tank. Many owners handle feeding and quick daily checks themselves and book a specialist for testing, water changes and equipment servicing on a schedule suited to their tank.
What should I do with aquarium fish I can't keep?
Never release them. Fisheries and Oceans Canada suggests finding someone to adopt them or asking a pet store to take them back, with humane euthanasia by a veterinarian as a last resort.
Can an aquarium be built into a wall?
Yes. An in-wall tank needs framing designed for its weight, a service area behind or above it, ventilation for heat and humidity, and a protected electrical supply. Plan it with the specialist, a carpenter and an electrician before the wall is opened.
Sources
Written by the LokalMatch editorial team. Reviewed by Zubair Afzal on September 10, 2026. How we write and check our guides