If the kit showed signs of leakage - all the dried minerals in and locking the cap - I would return the kit as defective, whether out of date or not.
I don't have enough experience with API kits to offer suggestions on cross-reading from SW to FW. If the solutions are the same in both kits, then you can cross-read readily. Others here likely have more experience with API kits and can offer more accurate suggestions on that, it is the most popular kit here.
nitrite stuck at .5 ppm?
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RTR
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Re: nitrite stuck at .5 ppm?
Where's the fish? - Neptune