Hi all! It's been a while since I've posted here. I have terrible lurker tendencies. I am well on my way on the octopus odyssey. I have all my equipment and have been running the system for about 3 months. I have a brittle star and a sergeant major fish (which was almost free). I am having an issue with pH. It's been great (8.2) up until about a month ago. It is slowly going down, and I don't know what else to do. It's down to 7.6 now. I've done 2 25% water changes, and a through cleaning of the substrate. I'm considering adding a buffer, as a last resort. Does anyone have any advise? Thanks!