Marine & reef
Moving a marine or reef tank: what changes
Updated · 8 min read
Everything in the general aquarium move guide still applies to a reef, but the tolerances tighten. A freshwater community tank forgives a slow afternoon; a mixed reef notices.
These are the points where a marine relocation genuinely diverges from a freshwater one.
Salinity is the parameter that catches people out
Evaporation from open containers during transit raises salinity, and topping up at the other end with the wrong water swings it back the other way. Both directions stress corals. Containers should be sealed, and any top-up should be pre-mixed and matched before it goes anywhere near livestock.
Corals travel separately
Corals are bagged individually or in small groups of compatible species, in their own tank water, insulated. Stinging species sharing a tub is a common and avoidable loss. Keep them upright where the shape demands it, and minimise the air gap so they are not battered against the bag during the drive.
- Bag by compatibility, not by convenience
- Use the tank's own water, not freshly mixed saltwater
- Insulate for temperature stability rather than warmth
- Keep them dark — light plus stress plus transit is a bad combination
Live rock is biological filtration, not decoration
Live rock that dries out or sits warm in a bin will die back, and die-back means ammonia the moment it goes back into the display. Rock should travel in tank water where weight allows, and damp and cool where it does not, with the understanding that longer transits make a post-move cycle more likely.
Sumps, plumbing and the rebuild
The rebuild is usually the longest part of a reef move. Photograph the sump layout, label return lines and unions, and drain the sump into its own containers so the water can go back where it came from.
Skimmers need retuning after a move and will overflow if they are left unattended in the first hours. Plan for that rather than being surprised by it.
Afterwards
Run lights low or off for the first days, dose nothing new, and test for ammonia daily at first. Corals often sulk visibly for a week and recover fully — the temptation to intervene chemically usually does more harm than the sulking does.
Frequently asked questions
- Can corals survive a house move?
- Yes, routinely, when they travel in their own tank water, insulated, dark and bagged by compatibility, and when salinity and temperature are matched at the other end. Most coral losses after a move trace back to a parameter swing rather than the journey itself.
- Should live rock be kept wet or damp when moving a reef tank?
- Submerged in tank water is best. Damp-and-cool is a workable fallback for short transits, but it risks die-off that releases ammonia into the rebuilt tank, so it should be paired with careful testing afterwards.
- Do I need to make new saltwater before moving a reef tank?
- Prepare matched saltwater in advance for topping up, but refill primarily with the tank's own transported water. Mixed water should be at the same salinity and temperature as the system before it is added.
Keep reading
- How to move a fish tank without losing fish
The full order of operations aquarium movers use — from the week before the move to the first water test in the new house.
- Keeping filter bacteria alive during a move
Glass can be replaced and water can be remade. A mature biological filter takes weeks. Here's how to carry it with you.
- What affects the cost of moving a fish tank
Why two tanks of the same size can be quoted very differently, and what to tell a mover so the quote you get is the quote you pay.