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are you using RODI water to mix SW and for top off?

I had a similar problem in a 5 gallon freshwater tank, basically any shrimp I bought would seem totally happy for about a month and then I would wake up in the morning to find them dead with no obvious reason.

I set up my reef tank and purchased an RODI unit, so I started using RODI water for top off as well as about 50% of the water I use for water changes (in the 5 gallon freshwater tank not the reef tank) and since I started doing that the last shrimp I purchased has now been alive roughly 3 months and is molting every few weeks and seems very happy. I suspect my tap water had some heavy metals or something that was accumulating in the shrimp over time. if you don't have an RODI unit I would recommend one.
 
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