So I let the tap water sit out since last night. The pH is definitely lower after sitting than coming straight out of the tap. However, the pH in the aquarium is still lower. Ammonia is still at 0, but nitrite and nitrate are still showing 0 as well. I have as yet to have any detectable nitrite so I am thinking the nitrogen cycle has still not started. I have used Quick start intermittently, but Seachem Prime mostly. The highest the ammonia ever got has been 2.0.
Thank you for all of the info. I do feel better about the pH as the drop has not been as drastic or fast as I first thought since the water has off gassed while in the aquarium. However, should I be concerned since it is reading between 6.6 and 6.8?
As for what we think is fin rot here is a pic. The bottom looks more stingy towards the front. Thanks again for all of the help!