Yesterday all the power to my oldest established cichlid tank (55 gallon) failed during the day, and when I got home the temp was down to 65. I fixed the power issue, installed a 2nd heater and did a 25% water change with warmer water. Temp within a couple hours was back up to 77, but I'm concerned what the outcome of this stress on my cichlids may be. This morning they all seem fine, temp is still good, but I know that this type of stress may leave them vulnerable to disease/parasites etc. Anyone have experience with this? Any info greatly appreciated.