"Daniel Morrow" wrote in
:

what else)? Thanks, give me an idea on how to deal with this! Good

I think you pretty well described the best way to deal with it. Take some
of that hornwort out of your tank. If you can collect a decent amount of it
your LFS will probably be able to give you a tiny amount of store credit
for it.

Guppies are not very bright and they are poor swimmers, so I'm not
surprised they managed to get tangled up in there, but I would be surprised
if they die as a result of it. Unless they're exhausting themselves to
death, they'd probably eventually be able to work their way out with the
aid of a little surface current.