[Pavel Chaloupka]

I have my C. simoni for about 3 days only, but have transfered them from tap water dropping the water from the paro tank. This way you can transfer them in to very different water in about 24 hours. If they were ok with the water before, there would be no mortality of multiple shrimps at once becouse of water parameters. I had couple different shrimp species over time and I can confirm that shrimps are even more sensitive to environmental stress than the fish. I would assume if your fish were ok after decomposition of the plants in the tank and shrimps died, it could very well be because of very low oxygen content as decomposition of bigger ammount of plants could have consumed most of the oxygen in the tank for some time. In such a case paros would survive as they are able to use their labyrinth. Seems like the most probable option to me.