Regarding the use of Utricularia as cover in a fry tank. I have a copy of the
old Innes aquarium book which describes Betta splendens fry trapped by
Utricularia. Apparently the fry were too large to engulf, but they were
trapped by the head. This is a single anecdote in an old book, so take it
with a grain of salt. Utrics would certainly be safe with larger fry like
those of live bearers (although the parents might eat the Utrics).
cheers,
Nick
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Nicholas Plummer
nplummer@umich.edu
http://www-personal.umich.edu/~nplummer/homepage.html