Originally Posted by Hondatek
You can take the salinity down as quick as you please. No harmful effects come from lowering salinity quickly. When raising salinity you want to be careful . More than .001-.002 can dehydrate the fish .
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But this is an entire tank. Microfauna, inverts, fish, and everything else. Are you positive that none of this will hurt anything in the tank? If it starts killing that stuff off with a major shift in salinity then that's going to trigger an ammonia spike.