Does formalin/formaldehyde stain acrylic?

[AmazonAngel]

I have to treat my fish for ich but I have never treated an acrylic aquarium before. Will it stain the walls?

 

[night flight]

Shouldn't be a problem, no dyes.
I have use it in acrylic fry traps with no problem.

 

[Lupin]

I agree. It should be fine for use. Remember to maximize the oxygen levels as formalin depletes oxygen level.