So I am some times let's say lazy about cleaning my tubes after each test. Now in 5 years of fresh I have never noticed this before. Using these tedt daily while cycling my reef I have noticed blueish stains on the inside that won't come out even with scrubbing the inside. With paper towles.. do you all think I should toss these test tubes, or do you think it could still give accurate test results. I have used water just barely below boiling to try and clean and it still won't come out. Guessing its from nitrite test
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Sent from my HTC PH39100 using MonsterAquariaNetwork App
