So I have 2 tanks running (same room) a Fusion 15 AIO (has a refugium running in the second chamber 24/7 light currently) and a Deskmate 4.8. Both tanks are running a 7.5 - 7.9 pH, and Alk of 8 (assuming I am doing the Red Sea alkalinity test correctly). I do not currently have a skimmer, and a fresh air line would not be an option. The door is opened regularly in the room, and there's a fan running at all times in the room. I considered using kalkwasser either in my ATO, or on a doser, but I'm unsure if I would end up with my calcium being too high, considering the size of the corals. I do have a reef glass skimmer coming for the deskmate, but don't have any particular plans on putting a skimmer on the Fusion. I have had trouble keeping hermits and shrimp alive in both of these tanks (could pH be the culprit?). What can I do to raise my pH?