"George Patterson" wrote in message
news:2zbSg.2996$Kw1.250@trnddc05...

Sort of. It's not really connected to the current level of nitrites,
nitrates, etc. in the tank, but it does indicate that the ammonia and
nitrite levels will drop soon.

There is definitely dead stuff on the sandy bottom. Should I stir things up
into the water so that the skimmer has a chance to remove that stuff too?