Today was cleaning day for the tank, I have lots of hair algae and some dinos. I went in and was cleaning rocks for about an hour and a half. During this time all animals in the tank were acting normally. As soon as i started to add fresh saltwater into the tank all the fish swam start to the surface and were having trouble breathing. I immediately stopped adding saltwater at a gravity of 1.025 and added an air pump and turned on the power head in my tank. A couple minutes later the fish lost control of their swimming and began floating around the tank. I placed them in breeder boxes and watched them struggle until they died. My corals are miserable but not dead. I tested saltwater of tank at 1.026 and ammonia of 0. I use rodi water and had it heated up to the tanks temperature. What could cause the fish to lose oxygen? The alage?
#reefsquad?
#reefsquad?