Did you notice the same 'flashing' before you treated for Ich?
You mentioned your incoming water is soft, crazy soft so what test kit are you using? What are the actual test results for hardness (GH) and alkalinity (KH)?
pH of the incoming water may read one value but after the water off gases for 24 hours it may read a different value so try testing both ways.
You mentioned your incoming water is soft, crazy soft so what test kit are you using? What are the actual test results for hardness (GH) and alkalinity (KH)?
pH of the incoming water may read one value but after the water off gases for 24 hours it may read a different value so try testing both ways.