Curveball or Slider

I have trouble spotting up my curveball and it is an off and on pitch for me sometimes it works great other times not so much, my question is should i ditch my curve and work on a slider and would a slider be harder on my arm because i have had arm problems in the past, such as tendonitis, any help would be greatly apreciated.

For one a slider is the most damaging to the arm, trying to get a ball to spin hard while at fastball armspeed aint healthy. I wouldnt change to a slider, just work on your curveball. After a while you muscle memory will kick in and the curveball will be as easy as the fastball.

ok, thanks for the advice