I have a new 37 gallon tank that I set up 2 and half weeks ago. Right now I have danios in it to cycle it. While cycling, will pH also change? I have checked every rock and the gravel with muriatic acid and none of it reacted. I also have a piece of drift wood and live plants. I have been lowering the pH with acid buffer to about 6.4 but within a day it is up to 7.2. Last week it seemed to be stable at 6.4, but this week it started to rise. This week the NO2 also rose (as expected). I was just wondering if there is a connection. Thanks! Eric ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Eric Martina University of Illinois Electrical Engineering ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!