I have a 120G tank that I just finished cycling (pics in the gallery) and today I started stocking. My plan was corys, a large school of cardinal tetras, and about 8 angels. The guy at the LFS (I don't always trust them but this place seems really good) said that in Indiana the water is way to hard for cardinals and said that unless I am running RO water I would not be able to keep them alive. So I started reading and see that a lot of people can't keep these fish alive. Once my tank is established are these fish that hard to keep? I was originally going with neons but was told that the cardinals get bigger and the angels will be less likely to eat them. The guy at lfs said the neons are hardier and I would be more likely to keep them then cardinals. He said either species will be a meal for the angels once they get big enough and decide they want to eat them. What do you guys think? I just thought it would be awesome to have a school of about 30 of them in a planted tank.