Yellowing on Thryptomene saxicola

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Location
Russia
USDA Zone
5a
I keep getting yellowing on my Thryptomene. Treating the leaf with iron or repotting helps, but then chlorosis begins again. I grow in a well-draining substrate and fertilize 18-18-18 times a week. What am I doing wrong? Maybe too much phosphorus? But as far as I know, myrtaceae are not sensitive to phosphorus.
 

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