Typical PH swing?

I know that ph is lower in the morning than during the day or late evening. What is the typical/acceptable swing to expect?
My signiture at the bottom of the page will show my chart info.

 

Mine goes from high 7.9's to 8.2's. If you run a light in your sump that is reverse light cycle of your display lights, it will help keep photosynthesizing going on at night to keep your ph up.

 

i run a light in the sump at night for a few hours, but not all night long. Should i change it to all nite long?

 

Mine is 7.9 to 8.2

 

I would. I've got some chaeto for you if you need something to grow down there.

 

That is very nice of you Adam. I currently have a decent sized clump in there now. thank you though. =0)