Formalin or other Brook-cure

[WuHT]

Well under hypo treatment..my emperor angel (and to an extent my other fish) appear to have some sort of peeling/thread-like filaments from their bodies.

Since has not eaten breakfast, i believe he has some sort of Brooklynella ?

Where can i obtain some formalin, as JL aquatics said it's "controlled" in our area ?

Any other anti-brook treatments that are effective ?