Hey

Does anyone know a website or other source for identifying the random
inverts that turn up in the tank?

I started on some trimming today and noticed some strange little creatures
in the water:
http://members.optushome.com.au/mime/px/mantis.jpg
http://members.optushome.com.au/mime/px/waterflea.jpg

I quite like having them, but as i'm setting up a tank for fry, i'd like to
know if any of them are dangerous.. i've read that the aquatic larval
stages of some insects are surprisingly dangerous predators. (or
alternatively they could be a source of live food)

thanks for any help

jay