Your water is still "100% freshwater"...as mentioned, you aren't changing the chemistry towards brackish/marine by adding that type of salt.
From reading through your other thread, the big issue I see is that you still don't know what your water is like in terms of ammonia/nitrite/nitrate or even other chemistry.
From reading through your other thread, the big issue I see is that you still don't know what your water is like in terms of ammonia/nitrite/nitrate or even other chemistry.