malachite green for ich

I'm not aware that it does. Generally, there are only two things that have a long track record of curing ich: copper and hyposalinity. I'm not saying other things won't work, just that in most cases they don't, and the ones that do don't have the history that copper and hypo do.

Read this:
http://atj.net.au/marineaquaria/marineich.html

and this:
http://atj.net.au/marineaquaria/hyposalinity.html

and you will know everything that the best expert here knows.

Good luck.
 
Head straight for the Fish Disease Forum and take advice there. To answer your question, no. Don't use it. You'll nuke your tank.
 
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