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Tested water and used my new Hanna ALk checker:
Alk - 12.6 Hanna, 13 API
Calc - 460
Phosphate - 0
Nitrate - 30/40, closer to 40, color chart was in between
I have to say Hanna was easier than API but similar results.
I am now thinking Nitrates are causing my Diatom problem.
I started...