Everyone seems to be worried about the ph at 7.8, why? Ph should be 8- 8.5, two tenths isn't a lot and besides PH goes down with the lights on, what is the PH with the lights off? BTW I run my tanks ph@ 7.8 with lights on, no problems. I bet most on here if checked would fine the ph was lower with the lights on and below the 8-8.5 recommendation. I agree if it continues down this path get it to someone who has a stable tank and see if it gets better.