Wendell, when you added the ro/di water, how come you didn't mix the salt to the water before you added it to the tank? I would be concerned about salt setteling into the sand, thus causing a slow increase in salinity.
Maybe take out 5 or 10gl and mix your salt in the pails first just to be sure all the salt dissolves.
Do you have any live rock in there also?
I think after it runs for 24hr or so, things should look alot clearer.
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