Zeo-Light HTU: keep K 390-420 mg/L and ~20 mg/L below Ca; elsewhere target 440 mg/L in the short version.
faunamarincorals.de/en/Elementals-K-1000ml/14110V
faunamarin.de/wp-content/uploads/2021/04/FM_HTU_ELEMENTALS_EN_NEU_291121.pdf
lab.faunamarin.de/en/calc-elementals-once
faunamarin.de/wp-content/uploads/2020/10/FM_HTU_Zeo_Light_System_EN.pdf