"Mortimer Snerd" wrote: <snip> >avoid submerging the cord for any length of time. Unless you are >experiencing major pH swings (I was seeing ones of a full point a day due to >too much light on my previous tank) the automation is probably overkill. I <snip> By "full point" you mean a decimal point ? Such as in 6.8 -> 6.9 ? -Ivo Busko Baltimore, MD