High Alkaline Water Aquarium. Ph changes in the aquarium, even if small, can have serious health effects on your fish. Is high alkaline water bad for fish?

You may notice a sudden increase in green algae growth on the walls and ornaments in the tank. Waters that have moderate to high levels (50 mg/l or greater) of total alkalinity and total hardness usually have. Even small changes in the ph of your aquarium can have serious health effects on your fish, even if they are small.