Can adding top off water hurt echinoderms?

[SquidySpecs]

Could adding top off water affect the salinity enough to shock sea urchins? I assume no, since i have a few asterina stars that are fine with it but those are also very hardy so I wanted to make sure. Thinking about getting a tuxedo sea urchin since I like them so much.

 

[Tamberav]

Why would top off water effect salinity to any degree? Are you not topping off often enough?

 

[SquidySpecs]

Why would top off water effect salinity to any degree? Are you not topping

Oh no it would never change by even .001, I've just heard echinoderms are really sensitive to salinity changes so I wasn't sure how much it would take.

 

[Tamberav]

Oh no it would never change by even .001, I've just heard echinoderms are really sensitive to salinity changes so I wasn't sure how much it would take.

Oh, ya it is no problem.

 

[SquidySpecs]

Oh, ya it is no problem.

Thanks a lot!