expired test kit

i use kent liquid reactor as a calcium additive in my tank. when i used this new test kit (api) that i bought it showed only 300. so for the past week ive been adding the calcium. still has not come up one bit. day before yesterday i got a film on top of my water. i have 2 of my powerheads stirring the surface and they couldnt keep it off. so i got to looking at my test kit and the expiration date is may 2007. i called the test kit company and the guy told me it should still work just fine. what do you guys think?
 

aztec reef

Active Member
Well you're going to get a film anytime you add a bunch of chemicals at once without knowing the levels of each.. The kent reactor is much more than just calcium, its also includes magnesium , strontium,alkalinity and buffering supplement..
chill out on dosing, do a Large water change and retest-.. this time check for alk, ph, magnesium too.
i recomend better test kits such as Sali..
 
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