Test Kits

Aquarium test kits for reef tanks

You can't see water quality, but you can test it. Our aquarium test kits measure the things that matter most in a reef. That means alkalinity, calcium, magnesium, nitrate, phosphate, ammonia, pH and salinity.

What to test, and how often

In a new tank, test ammonia, nitrite and nitrate often, until the tank has cycled. In a reef with stony corals, test alkalinity every few days, because it changes fastest. Also check calcium, magnesium, nitrate and phosphate every week or two.

Keep a log of your results. Over time, it shows trends before they become problems.

Common questions

How long do test kits last?

Most reagents expire. Check the date, and store kits out of heat and sunlight.

What should I do if a test is off?

Make small changes over several days, rather than one big correction. Our salt and additives can help.