Acclimation and SG

[fadec40]

The LFS that I deal with is a serious store with fish being its main piece of the business. When I set up my SW tank, he recommended that I keep the SG at 1.018 for a FO setup.
They keep their FO water at 1.018 like he said and I have checked it with a refractometer when I purchased a fish there.
Now I notice that most of the people here seem to keep their SG at anywhere from 1.023 to 1.026 as most have reef and/or fowlr.
I have two questions:
The first is should I really raise my sg to 1.023-1.026 for FO with a few snails?
The second question is on acclimation. If I do raise the sg to, say, 1.024 or so and I purchase fish from this same LFS, will the acclimation of going from 1.018 LFS sg to my tank 1.024 have a negative effect on the fish even though I acclimate the fish properly.
In other words, is there a limit on fish going from one sg to another?
Thanks all!

 

[rev]

that's what acclimation means.Taking from 1 area and putting to another.The reef shop I go to does the same thing.They keep the water sg low (1.016-1.018) my tank is 1.025.2 hours drip acclimating will work fine.
I have noticed that the snails need higher sg.I too have a fowlr setup,and without the snails,it would be a dirty tank.So I would keep the sg up around 1.023-1.025

 

[fadec40]

Thanks for the reply, Rev.
I understand about the acclimation, I was asking about going from one extreme to another.
Why do the shops keep it that low? Is it better for the fish to acclimate to higher SG rather than a lower sg?