When adding salt for ich...

i've done both with no side effects. i use 1tsp per gallon. some people use more. i find that amount sufficient. it's more important to remove it slowly so the fish don't go into shock
 
table salt is all you need..and much cheaper...
 
Just make sure the salt you use does not have additives (such as iodide).

And I agree with dissolving the salt in a container of warm tank water before adding it to the tank.
 
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