Antwerp Zoo is going to move its common seals to other zoos. The reason they state, is that the current seal housing is not up to wellfare standards. At the moment, the Zoo keeps to groups of common seal in two different enclosures: the former sea otter enclosure and the pelican pond, the latter of which was set to only temporarily house the seals while the actual seal enclosure was used for California sea lions during construction work at the sea lion enclosure. It is expected for the seals to return to the Zoo once the sea lions have moved away (which has been planned for some years, but has been delayed due to a complex set of different factors). A breeding group of Dalmatian pelicans will return to the pelican pond, while the former sea otter enclosure will get new inhabitants that have not been announced yet.
Source: Mijnzoo.be (online platform for members of the Zoo)