Anything I should worry about?

[Loganspeed]

Small bump on his back. Behaving normal, just introduced last weekend. No QT

 

[Big G]

Welcome to R2R! Have you treated your fish prophylactically at this point for any diseases or conditions?

 

[melypr1985]

Honestly that could be one of many possible things. I'd suggest a "wait and see" approach to this one. Good water quality, high quality foods, added vitamins and low stress will all help you get ahead of anything malignant. You'll want to watch for flashing, scratching, breathing heavy, swimming into the flow of a powerhead, hiding excessively, lack of appetite, the lump getting bigger or changing colors and for the dreaded white spots.