Nutrafin pH High Range 7.4 to 8.6 for Fresh and Saltwater, 125-Tests Suitable for freshwater or marine aquariums to establish the right pH range for your fish (7.4-8.6) Monitors ammonia toxicity level Best used in aquariums containing most common tropical fish, such as African Cichlids and marine fish Tanks pH levels should be monitored regularly as they have a direct effect on the well-being and health of fish Easy to follow directions; Contains 125 Tests