08-22-2010, 01:38 PM
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kitten, I'll leave it for the goldfish folks to say why, there have been other threads here and the advice is always to never mix goldfish and tropicals. I'm afraid I haven't paid much attention to the reasons, as I never contemplated doing it myself.
thefishboy, there are lots of options for tank mates for corys. First question is, what are your water parameters (pH and hardness) in the tap water? That will tell us whether soft water fish or harder water fish are best (corys are soft water but manage in slightly basic water). Also, is there a particular cory species you want? They are a bit different from species to species respecting water and temp.