fish are alive...
temp....
ammonia level, no sudden spike ....
filter is not gloged, and working...
glass is not cracked ...
alertness of the fish , behavior....
body condition,damage from late night fight.......
feed them , though not every day do I feed my fish ..6 -times a week. and remove uneaten food .....
Lid on tank is in place .......
Sit there like this
for an hour 
temp....
ammonia level, no sudden spike ....
filter is not gloged, and working...
glass is not cracked ...
alertness of the fish , behavior....
body condition,damage from late night fight.......
feed them , though not every day do I feed my fish ..6 -times a week. and remove uneaten food .....
Lid on tank is in place .......
Sit there like this
for an hour 