Vasile Surducan wrote: > By the way what pH precision you need and what is exactly the > saltwater content ( % ) in your tank? > Vasile > > ********************************************* > Surducan Vasile, engineer > mail: vasile@l30.itim-cj.ro > URL: http://www.geocities.com/vsurducan > ********************************************* In my tank I keep it at 82 degrees F and the salinity @ 35ppt (1.025 sg). some people may keep the temp as low as 70-72 and salinity around 1.020. depending on the tank and what the owner believes is right :) temp swings range from 78-85 over a 12 month period.