My PH is about 8.0 during the day and 7.8 at night. I have a Refugium that has Chaetomorpha Algae growing (spaghetti). My water KH 12, PH 7.8-8.0, Calcium 420, nitrate 0, nitrite 0, ammonia 0, Mag 1300, Temp 79F. I do not cover my aquarium and do bi-weekly water changes. My lighting is 2 65W compact fluorescent. Any suggestions.