Aww I'd really like the pandas for my 10 gallon because they stay smaller than a lot of cories, and they're so cute! But I don't want anyone to get hurt so maybe I'll try a hardier species of corydoras if ph could be an issue for them. Thank you for the information!
A smaller cory that is hardier than pandas is the albinos, usually only getting around 2-3 inches, and in my opinion the albinos seem to be a bit more active than most cory. I personally LOVE my habrosus cory, who only reach just over an inch full grown, but it is said that they are very sensitive to water parameters and some dont have great success with them. Thankfully I have had much success with my little guys and think they are the cutest cory ever!!!
However, habrosus cory wouldnt do so great in the pH you are talking about. I too considered panda cory, but after much research decided not to get them from many stories about them being rather delicate....and then I end up with an even more delicate cory (habrosus), but it worked out. lol
As far as adjusting pH, (I have posted many times before about this product, some might not agree, but in my experiance it has been WONDERFUL, and know many who use it)...It is called "Correct pH" by Jungle and is sold for $3 and some change at Walmart. They are dissolving tablets, one per 10 gallons of water every 3-4 weeks (or when pH starts to raise). They are relatively harmless and keep the pH as close to 7.0 as possible, and it also eliminates the ammonia in the tank. (Each box contains 8 tablets, enough to treat a 10 gallon tank 8 times, so for about 6 months give or take.) I use this product regularly in both of my tanks. It keeps my pH between 6.8 and 6.9 in both my tanks. It is specially designed not to immediately change the pH but very slowly as to not send the fish into a deadly shock.