just an update if anyone was curious. I left one of the pieces of driftwood in a 5 gal bucket for just under a week. The initial ph of the water in the bucket was 8.5 which has since dropped to 6.5. So I have found the culprit, I am still going to leave the other piece of driftwood in the tank as I dont think there will be much of an effect in a 55g with water changes.