Dude to funny, if your talking about plumbers tape for straps I have the same issue going on under my tank. I thought that stuff was galvanized evidently not.Not specifically, no. The last time this happened, i tested high for iron zinc and magnesium as well as had low sodium high chloride. I know magnesium isn't high this time, tests around 1290 or so, so i would think maybe high iron/zinc could be at issue? I do have some rusty hardware above my sump as well as some serious bryopsis and GHA issues that won't go away where they would normally leading me to think i may indeed have high iron/zinc once more.
I just did a 25 gallon water change and pressure washer'd my mixing drum out. Going to make up another 55 gallons and hit it again in a few days. Not sure how i am going to want to address my rusty plumbing straps yet though.




