I just found out that the power will be shut off in my apartment complex for up to 7 hours on Wednesday. Maybe longer. I have 5 fish tanks currently running a 130 gal. w/ catfish, bala sharks and a spotted gar, a 90 w/ s. American chichlids, a 50 w/ African cichlids, and a open top 60 gal planted tank w/ assorted community fish. I am very worried about temperatures dropping and oxygen levels in particular. Do I even need to worry? If i do what are some precautions I can take? Thank you in advance for any help.