Do I need to adjust my Specific Gravity?

[GreenSpottedPuffer]

Originally Posted by Myka

1.022 to 1.026 is normal for FO and FOWLR tanks albeit there is no good reason to have it any lower than 1.025, where reefs should be 1.025 to 1.026.

Higher oxygen saturation in the water and ionic regulation of salt from the fish should be easier at a lower salinity. Nothing wrong with 1.019, I know a few FOWLR tanks running for many years at 1.018.

As for the Stars and Stripes, it shouldn't be the salinity bothering him. They often spend their juvenile lives in Brackish water estuaries. He might just be a lazy puffer as so many are.

[Myka]

Originally Posted by GreenSpottedPuffer

Higher oxygen saturation in the water and ionic regulation of salt from the fish should be easier at a lower salinity. Nothing wrong with 1.019, I know a few FOWLR tanks running for many years at 1.018.

As much as I'm aware of this I've personally seen no benefit, and I don't see any rationale to keeping the salinity so far away from NSW.