formalin

So for my qts, I am dosing copper and nitrofurazone (along with other meds if needed like intestipro) but recently I have had a uronema outbreak. I was wondering if I can dose Ruby Reef Rally Pro or Formalin in my qt along with copper and nitrofurazone. I saw on humblefish forum that you can...

I was at my LFS yesterday and one of the owners told me they had to pull all of the medications that contained formalin/formaldehyde because it had been banned due to carcinogenicity. Has anyone else heard of this? That would be a blow to disease treatment, as formalin can be very useful. Like I...