| Re: dead fish
There are two problem areas likely to cause loss of all your fish.
The first is some sort of external poisoning. This could be from spilling something into the tank, or spraying for bugs, or anything else that might get into the tank.
The second is a loss of power and everything suffocated due to lack of oxygen.
In either case the advice given by BigAl is excellent, many large water changes and carbon filtration. |