Good water quality is the key to healthy fish and trouble free fishkeepingr traditional methods of testing the water can take time and are not ideal for situations where time is limited or when frequent testing is necessary for example in newly established aquariumsr the tetratest 6 in 1 dip test offers a perfect solution by testing for 6 essential water quality parameters in less than 60 secondsr simply dip one strip into the water and within a minute you will have readings for nitrite