peppered cory turning brownish red?
 

After i introduced 3 corys to my tank, they turned red. Is it because im usign gravel adn not sand and they're hurting themselves? or are tehy sick with something?

o wow, sry about the intro post, my typing was horrendous. 2 died shortly after turning red and the last remaining one has become mroe active than ever and the redness is disappearing. I think i might have just acclimated them wrong...