Water Changes and PH Swings

I recently joined up and I wish to ask a question about water changes and ph. As per Tom's recommendation on another forum, I recently added CO2 to my 30 Gallon Long (about 6 hours ago) and my ph is headed down very slowly (I have it set at about 25 bubbles per minute and will adjust if necessary). I religiously perform a 50% water change weekly and since my city water has a rather high ph (7.8), and I will be keeping my ph around 6.75 to get the desired ratio of CO2 with my KH of 4, will the rapid ph change be a problem for my fishees? If so, what would you recommend. I have 4 cardinals, a ram, 6 otos, 2 cory juliis, 3 diamond tetras and 1 female betta in my aq. By the way, is that too high a fish load in your opinion?

Thanks,

Mike Herod

 

Re: Water Changes and PH Swings

Thanks Cliff,

Enjoyed the meeting. You've got some great looking tanks.

Mike

 

Re: Water Changes and PH Swings

My PH did swing to 7.2 from 6.86 after my water change this morning and about the only thing I noticed with my fish was that they weren't eating their favorite food afterward. After I posted this question, I read the April Barr Report where ph swings were discussed for both water changes and turning off co2 at night and no fish health problems should occur with either is what I got out of it. I have read and or browsed all of the Barr reports now and that was one of my favorites.

Thanks,

Mike