Thanks!! My first attempt was mixing at 78 and it was disaterous. I don't know what I did wrong. Now I do it about 72/73 then warm it and adjust as necessary. That seems to be working better but I have to get a refractometer to confirm what my salinity pen is telling me. Brackish is so easy by comparison although after five days of doing it I think I'm getting the hang of it... I hope.I mix at between 74-78 in a 5 gallon bucket with a powerhead. My target is 1.025.