"If i just add the water with no salt, it drastically reduced the salt level in the tank. So i usually a day before i am to do the water change fill a bucket and dump salt in it to let it desolve. I stir the water so it doesnt settle to the bottem but it always seems that it settles to the bottem of the bucket, i pour the water into my main tank once it has aired, and then measure the salinity. It seems like my salinity never really goes up by much unless i just dump the salt sludge that collects at the bottem."
mmaglione., you add premixed saltwater, not freshwater to your tank. Ie: you remove 20g of old tank water and replace it with 20g of freshly made saltwater of the correct salinity to your tank. Do not add freshwater then add the salt to it.