green dots on my annubis

hi

recently i got an annubis plant for my 10G warm-water tank.  it's
seems fine but now has small, dark green dots all over it.  i put in a
crypto at the same time that is doing find and doesn't have the dots
on it.  i figure if it was algae it would be on both plants.  curious.
 anyone experience this?  is it some kind of plant disease or just
algae that's not growing on the crypto?  thoughts?

thanks!