they are more reddish in color. im going to stop feeding them right away, but could the harm already be done?

I have never got parasites from tubifex. I know people say it is "infested" with it, but I am not convinced. I wouldnt worry if I were you, but if you are not sure what it is, it would be best to find out for sure if you are worried about that before you feed any more.

Im just not convinced on the tubifex thing though. Id like to know what brands people have found parasites in and hear proof that a fish got parasites from tubifex and would like the see the articles and investigations done that supports this theory. Im not a big fan of rumors.