Gfo also messes with your alkalinity not a huge amount but it drops a bit , Randy has it noted and how much roughly it pulls out, this is a concern to sps guys who keep low alk or carbon dose.
I lost most my sps a while back remember to a alk overdose , the climb from 6-9 dkh resulted in rtn and then I pulled the doser the drop caused me as much harm as the raising did.
The cow fish is a concern too I would think.
Do you make your own food? If so Is it Possible that something changed and maybe contaminated?
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