International travel can be lonely, which is why one Belgian airport hotel provides guests with an optional companion: a pet goldfish, rented on a nightly basis for around $4 U.S., according to The Independent.

Located near the Brussels South Charleroi Airport, the Hotel Charleroi Airport in Gosselies has offered fish rentals for several years now. “The idea was to surprise our guests, as we always try to do,” hotel manager David Dillen told The Independent. “It’s brilliant to see how people react to it. They smile, they take pictures to put on social media. We rent a few fish per week.”

Word of the unconventional service spread after New Zealand radio producer Michelle Cooke tweeted a picture of one of the inn’s scaly sidekicks swimming in a glass bowl. “My friend is staying in a hotel in Belgium,” Cooke wrote in her post. “They've offered her the option of renting a fish for the night, in case she's lonely.”

The tweet went viral, with some social media users arguing that the service is unethical towards animals, or that the hotel’s fishbowls are too tiny. Dillen addressed these criticisms, saying the goldfish are healthy and well cared for, with a “big fish tank in the housekeeping department, with a shelter, oxygen, and plants,” as he told The Independent. “When we think it’s necessary, we put them there for a few days.”

That said, if you don't have a good track record with fish, we recommend sticking with regular hotel amenities like free breakfasts and fully stocked minibars.

[h/t The Independent]