Help! Caring for tank while the real owner is overseas. Sump issues

[Vilan]

Hi!

Pleased to join this community. My love and I share seven tanks together, fresh water and reefs. He had to travel overseas so I'm taking care of the tanks - and now need help. Can't reach him because of time difference.

Our REEF OCTOPUS PRIME 200-int is bubbling over. The lid Is coming off. Not sure what to do