Sera Protazol
 

What is it bis(4-dimethylamino-phenyl)-phenylmethyliumhydroxid in Sera Protazol, please? Is it safe for catfish?

https://www4.sera.de/site/products/p...54&language=de

The trivial name for this substance is "malachite green", and it's the active ingredient of about every remedy for Ichthyophthirius and the like.

Safe for catfish.

Thank you. :-)