carcinoma said:When saltwater evaporates, the salt particles stays in the remainder sump water, its only the H20 that is gone. So when you top off the evaporated sumps at the store with RO or tapwater, the amount of salt in the water is still there. So the salt amount stays the same. So the grouper was still in saltwater. Your story would be more valid, in terms of converting the grouper, if you actually removed the physical water (thereby removing the salt in the water) from the tank and sump and replaced it with pure RO or tapwater. But maybe I'm just reading your post wrong.
this is true, but if they are selling fish then they are removing water from the system. dependidng on how many fish they sell the salinity could change alot or little.
