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mineral wool bad for fish?

hi all.

my second post.
i've got some jave fern attached to wood via it's mineral wool(basially, i
found when i took the fern out the pot and pushed the mineral wool onto the
wood it stuck tight, thuis i attached it that way) i thought it'd be ok.

then i read in a book a few days ago that the mineral wool and/or the lead
strips used to wrap theroots up should be removed and the plant wahed
thorourly. is mineral really bad fo fish or something? i would have thought
it stupid to use something in plants that go in aquariums that can
potentially kill fish...