Rocks and pH Hi Folks, Both my aquarium and my tap water measure a pH 7.8, and my aquarium has stayed stable at 7.8 since I set it up in early February. I know that this is a little high for community freshwater fish, but I acclimate my fish very slowly, and I have been operating under the assumption that stability of pH is more important than the actual number. I was recently on vacation in North Carolina, where I picked up a number of rocks while out on hikes (I am attaching a few photos). I read an article that recommended putting the rocks in a bucket of aquarium water for a week and compare pH before and after the rocks sit for a week in the bucket. So upon returning last week, I did a water change and filled three buckets with aquarium water in which I placed two or three large rocks in each bucket so that the water just covered the rocks. After sitting a week, the pH dropped from 7.8 to 7.2 in two of the buckets and from 7.8 to 7.5 in the third bucket. What I did not do was test each day; therefore, I do not have any sense of how rapidly the change occurred. I plan to do another water change today, and change out the water in these test buckets and test at the one hour, three hour, 12 hour and 24 hour points to try and get a sense of how rapidly the change occurred. Ideally I would like to have the pH around 7.2 or 7.4, but I would prefer to not to have to manage pH on a weekly basis if I can avoid it. Do you think that adding these rocks would buffer the pH at a lower level, providing stability at a lower level? Or do you think adding the rocks could create a less stable environment regarding pH? Is it possible that there would be a short term effect on the pH, but over the long term the water stabilize back at the higher 7.8 level? Do you have any thoughts on acclimating the fish to the lower pH?