testing my Alkalinity on a fresh batch of mixed water with reef crystals and it is coming up as 0. I tested Alkalinity straight and it showed that there was alkalinity present. I'm using a red sea test kit. Anyone else have this problem?
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07/21 it expires. used 5ml of tank water then drop, shake, check for blue or yellow. and repeat till yellow.Expired test kit? User error?
RC usually has very high ALK.
Are you sure salinity is good?
Those are some bizarre numbers you're getting their.
Other then that, maybe just a bad batch? It's one the reason I switched back to regular IO years ago.

