What's safer - High or Low Specific Gravity?

[TygGer]

I understand that ideally the specific gravity should be 1.025, but would a lower or higher specific gravity be more tolerable to the fish?

 

[snapcrackler]

Definitely lower. 1.025 is pretty much the highest SG you're gonna want for anything, inverts being the saltiest of the crowd. Fish are happy with lower salinities as well.

Higher would begin to be bad.

 

[indy]

Pick a value between 22 and 25 and keep it there. Consistency is more important than the actual #, as long as the # is reasonable. Old books and some folks recomend a sg of 19 to 20 as it is supposed to stress the fish less, but most people don't follow that theory anymore.

 

[fishfreek]

Obvously any extreme will not be good. Be it 1.035 or 1.015

 

[MarkW19]

1.023 - 1.024 is a good number.

 

[reefrunner69]

According to Dr Ron, a higher salinity is less stressful on fish and inverts than a lower specific gravity.