Originally Posted by dynamite.
Sorry for kinda stealing this thread, but I have never heard of putting fish in water troughs. What does it do?
They eat mosquito larvae and some algae.
But, I agree, add a little bit of fresh water everyday - that will ensure they have enough oxygen in the water. If there are bubbles around the heater that's not a good sign. When I had goldfish as a kid, clumps of bubbles would form around the edge of the tank at the water line as a sign that the water needed to be changed... or so the pet store told me.