For some reason every res change my ph rises dramatically and I'm most likely attributing it to algae. Idk why it happens since its light proof and good temps but it happens. However, I add about a drop per gallon of water of the tetra algae control and put in a little fish tank stuff with aloe Vera in it in a cup and add it to my res. This stuff has saved me a lot of time and is really convenient. I really recommend it if anyone has similar problems. I tried using teas but, maybe I am doing something wrong, but they make things worse and are kind of a hassle.