the older kits didn't use to have expiry dates but all the newer ones have a date stamped on the top (or sticker) for expiry. i know this because i had to buy a new saifert nitrate kit because apparently mine had expired and was giving me wonky readings 
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Given sufficient thrust pigs will fly just fine.
90 Gallon LPS tank - Challice, Acans, Favia, Diplo and Zoos
125 Gallon SPS Coming Soon!
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