Fumigation means the fish move out
Whole-home fumigation is the one household treatment where protecting the tank in place is not an option. The gases used are chosen precisely because they penetrate sealed cupboards, wall cavities, and packaging, and they are lethal to fish at concentrations far below what the treatment uses. Plastic film and tape will not save a tank, and the fish cannot simply be sealed in and hoped for. The fish, ideally with their filter media kept wet and alive in tank water, travel out — to a friend's house, a fellow keeper, or a boarding service — in lidded buckets with battery air, a day before the treatment if the schedule allows, and they stay away until the property has been cleared and aired for the full period the treatment company specifies. Ask that company directly when aquatic life can return; do not guess from how the house smells.
Painting is a sealing job, not an evacuation
Ordinary painting is a different order of risk and the tank can stay, provided you treat the top of the tank as a doorway that must be closed. Clean plastic film, taped carefully around the rim and cabinet top so no gap remains, keeps paint mist and the worst of the fumes out of the water. Then deal with the equipment that deliberately moves air: switch off the air pump, and if you run a protein skimmer on a marine tank, switch that off too, because both are machines for pulling room air into the water. Lights off under the covering so heat does not build, and keep the room door shut while painting happens elsewhere in the house. Water-based paints are far kinder than solvent-based ones; if oil-based paint or varnish is planned for the tank room itself, moving the tank's fish out for a day becomes the safer call again.
The day of treatment: order of work
Sequence matters more than effort. Feed the fish early, before you seal anything. Check the water and do a partial water change the day before painting, so the tank starts the sealed period in its best condition. Lay the film smoothly rather than in folds that can slip, tape it to glass and cabinet — never let tape or film touch the water surface — and cover the cabinet doors as well, since drips run downward. Have buckets, nets, and the battery pump staged and ready even for a painting day, because discovering a problem mid-job with everything packed away is how a manageable day turns into an emergency move.
Unsealing: ventilate first, uncover last
When the work is done, the order reverses with one rule: fresh air before open water. Ventilate the room thoroughly — windows open, fans if you have them — until the smell has genuinely cleared, not merely faded to someone who has been in the room all day. Only then peel the film away, taking care that dust and dried paint flakes on top of it do not rain into the water as it lifts. Restart the air pump, watch the surface, and skim off any film with a sheet of paper towel laid flat and lifted. Feed lightly at the first meal and watch appetites; fish that eat normally that evening are telling you the tank came through.
While the fish are away
A fumigation exile can run to days, and the friend hosting your buckets or a borrowed tank needs more than goodwill — they need the routine: what the fish eat, how much, which one bullies, what the filter does if it rattles. Write it down for them rather than delivering it from memory at the door. While the fish are away, KinsLe's Care Pass keeps their feeding, water checks, and quirks in your friend's hands as clear, temporary access, and it ends when the fish come home.