thrlride, mine also took five days
well i installed my orp controller this past friday (5:00 pm), placed the probe in the sump. by sunday around 6:00 pm it had leveled off to about 324-325 mv, so i decided to test the enaly. within 3 minutes the orp shot up to 375 mv, at which point my controller shut off the ozone. I concluded that my sump is too small an area to provide an accurate reading, so i moved my probe to inside the tank, to about 2 inches from the sand and slightly to the left of the return flow. by 7:00pm i had a reading of 348-350 mv, so i decided to test the ozone again. Here's the funny thing, the controller let the ozone run for about 10 minutes to 375 mv. literally two seconds after the ozone was shut off however the orp reading shot up to 610mv! for the next three hours i watched my tank to see any signs of stress, fortunately no one was harmed, everything seemed like nothing happened. however the orp took a while for go down. by 9:00am the next day (today) the orp was down to 385mv.
I dont understand what happened. for the moment im concluding that the probe is not balanced out yet, since according to the meter the tank had an orp reading above 400 mv for most of the night, yet nothing died, so i decided not to even touch the setup until friday.
anyone have any ideas what might have happened? how sensitive is the probe? right now i have it right against the back wall, however the current could bang it about a bit by the adjacent rockwork. is this a problem, or should i only be concerned about the very end of the probe (the part that was covered with plastic when i first received the probe)?
i recently broke my camera so unfortunately i cant post pics yet but will as soon as possible. but yeah the 72 bowfront is pretty sweet. thanks for the help and sorry for the long post