ive used it once .i bought it cos it was a catch all remedy.
it probably more or less kills your bio. filter unlike some of the other
remidies.-if not, it will have done alotta of damage . i tranferred the
fish to another small tank while i treated the big tank as well as the fish
cos the fish wont do well or survive with an immature filter and meth. blue.

so the answer is yes. i might have bought something else had i known

"Kodiak" wrote in message
.. .
Will Methelyne Blue treatment kill my bio-filter?
...Kodiak