I don't know weather it is just me, but no mater what I test I get the same result, I've just brought a new phosphate test kit, I think I have to much phosphate because I have a lot of red hair algae. I tested the tank and I get a reading of zero, Test tap water I get the same colour reading and zero (I have two test cards one for fresh water one for salt) I have the same with the big tank fresh water tank, The water test always reads perfect (even if I am over due for water changes) I don't know weather the test kits are expired when I have purchased them or what. In the last 5 or so years that I have bother to test my water I have never had a test that was not perfect (even when cycling new tanks) and I know dam well that the water is not! :oops:
Love to no others experiences with test kits