Dude how can u know he isnt trying to jip you with feeding his fish the kind of food that turns the fish red, but when u stop feeding the fish the "red food" it goes back to its original color...
I def. need pics...
Common fish at that price can easy find in lfs. I think for a $20 aro, don't ask too much. Red? After you see a chilly or rtg, you will have different opion on what is Red?