well i would start catching up on the stickies on the boards.
did u cycle the tank at all? (using bio-spira for a close to instant cycle or anything like that?)
that heater should be around 300w that is what im going to be using on my 55g.
do u have a freshwater master test kit to test for the ammonia, nitrate, and nitrite levels of the tank?
i would assume almost, if not all, those fish will die within the next few days, unless they adapt to the levels of the tank very quickly...
if it was me, i would take them back to the lfs
and then start cycling the tank (if u didnt in the first place)
EDIT: forgot sry...WELCOME TO AA!