RO/DI water bad for tank?

[robbyville]

That is really strange! Have you tried testing your RO water to ensure that your filter is working properly?

Traditionally the idea of the RO or RO/DI is to remove everything and then put the right stuff back in through your salt mix. You may also want to check the quality of the water after mixing but prio to addition to the tank, perhaps there is a salt problem.

What are the symptoms specifically that your fish are exhibiting?

Best,

Rob