I was under the impression that excel was light-sensitive and would degrade within a few hours once exposed to light. Everything I've read about it says that it needs to be dosed daily to work as a CO2 substitute.
I asked this question because I wasn't sure if there were other factors involved in its degradation. I know it's a chelator, but I don't know if it can be neutralized by KH, DOC, etc. That would make dosing the night before pointless.
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