A little off topic - hopefully not too much....

I have a 55 gallon tank I want to use for three small turtles and some
fish. The tank will be about 3/4 full of water and have an island in
the middle of it and that island will have real plants from the local
greenhouse in it's soil. The island will be supported by a tower of
cheap empty Tupperware boxes to prevent too much of a weight load on
the tank's glassy bottom. There will be pond vine plastic plants
covering the island's and tower's sides for good looks and a way for
the turtles to crawl onto land and otherwise get out of the water. For
fish I plan on guppies and maybe a couple of goldfish. I already have
a filter system pretty much set up and it is a bio wheel 60 which will
either be mounted like normal (on the tank's rim) or suspended from
the rim from a loktite valve device and airline tubing. My question is
this: can anyone here recommend any good newsgroups that I could use
to research and select the right kind of very small tropical turtles
for my tank (hopefully easy to care for)? Which one(s) (newsgroups)? I
also already have two submersible ebo jager (250 watts each) heaters
to keep the tank tropical. Thanks.