|
I think your LFS is getting confused between freshwater and marine "Ich". Malachite green combined with formalin can be effective for the treatment of freshwater "Ich". It is NOT effective for the treatment of marine "Ich". While freshwater and marine "Ich" are superficially similar, they are completely different parasites.
It is worth noting that malachite green is a respiratory poison and is suspected of causing cancer. You should only use it with extreme care - although it is of little value in a marine aquarium.
__________________
ATJ
|