Fin twiching in itself is nothing to worry about unless it's excessive. Somtimes it's just a dominance display, my male fishs do it all the time around other males and females if they want to breed.
Now I'm seeing bumps on two of my cichlas pectorial fins... One is white towards the end of the fin. The other is orange but it's more towards its body so the color is deeper on those fins. What now???