api is great for amonia so keep that one its the better of the tests available , nitrate aint bad either.
i use elos for calcium and it works bang on.
i doubt not rolling your bucket had anything to do with it, ive never rolled a bucket in my life once and my calcium stays consistent.
the reason yor calcium is low is because youve been adding for alk and mg.
if you were to add a calcium suppliment your other parameters are going to change slightly:P
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