Just to post some more accurate information, apologies for bump:
SeaWorld San Diego houses, in addition to their more common seals, one ringed seal. They don’t have a harp seal. The ringed seal is most commonly displayed with the beluga whales, where it’ll be the only seal on exhibit.
SeaWorld Orlando houses one harp seal, and no ringed that I know of. Within the past two or so years, the harp seal, Wiley, has gone on exhibit in Wild Arctic. He shares an exhibit with two harbor seals and two beluga whales. They all have access to off-exhibit space, so it’s not uncommon to not see either the seals or the belugas.