New to the game, can't tell what changed but these levels have been the same for months. Seems like the fish are stressing out. Tanks 9 months old, and I've done 5 gallon water changes every two weeks. Water at the house is always hard and high in alkalinity. Have 2 clown fish, pistol shrimp, mandarin, goby and cleaner shrimp. Also have 7 diffrent frags of corral