tank was cycled for 2 months, and has been running since February. I do not put anything back in the water when I do water change. Should. i treat for planaria?
He's talking about adding minerals to the RO water. RO water is chemically pure. I would think water without any minerals in it could cause all kinds of deficiencies. Maybe this is the cause of the dead shrimp? Obviously you should wait for somone more experience to chime in. The only experience with RO that I have had is with plant growing, and I know that with plants if you use RO and don't add in any micro nutrients to it, the plants will eventually die from lack of ca/mg/iron etc.