Overnight deaths??????? Help me figure this out
Yesterday I got a shipment of plants in, I added them to the tank. I noticed that the temp in the tank was a little low so I raised it up a little bit. Everything seemed great I went to bed
I just woke up and found 1 clown loach dead, the Angel laying on the sand breathing very heavy and another loach staying toward the top of the water.
I removed the dead loach, but when I went to remove the angel it swam away. not it is again laying on it's side.
The angel is at least 6 years old, and the 2 loaches that were effected (1 by death) are the 2 other oldest fish in the tank.
What could this be, and what should I do.