On 08/08/2012 17:16, Caddy579 at aol_com wrote:
I have a small pond here in Michigan that I put Sailfin Mollies in over the summer to control mosquitos. I bring them in over the winter and put them in a 20 gallon long. Over the last winter I seemed to have a heavy die off and some of them looked visibly sick with some sort of fungal disease. I've decided to completely reset and clean the tank before I bring them in.
If the pond water was nice and hard and the aquarium water was softer, then this probably caused it. Changes of water chemistry often causes stress and their immune systems can find it had to cope so they get disease much more easily.
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