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Hello, I was wondering if the core 7 has iron in the trace elements.
I’ve noticed my chaeto hasn’t been growing and yet my nitrate / phos is rising.
Have you run an ICP-OES analysis? If Iron is absent in your tank, then chaeto will yellow typically. If Iodine is absent, you will see lack of growth and eventual death of the algae.
C7 definately has Fe in the trace element composition