A fourth Reef Manta Ray (Manta alfredi), a big, black morph specimen with a wingspan of more than 4 metres, has been acquired by the aquarium. It is being housed in an introductory enclosure within the Open Ocean habitat. I believe it is a female as it seems to lack claspers.
Apologies for the poor picture quality as (1) the photo was taken with a phone; (2) the water was especially murky as I think raw seawater was mixed into the tank to help the new manta acclimatize; (3) the huge glass panel is starting to turn yellowish/greenish due to exposure to sunlight (so River Safari made the right choice by housing their flooded forest tank fully indoors).