My CAE, which started out silverish, is now golden with spots. He does still scrubs leaves and gravel of certain types of algae.
He's only recently started showing aggression toward certain types of fish in the tank mostly large flat fish like gourami's and he really hates my emporer tetras. He doesn't take notice of my school of tiger barbs, priscillia tretras, corys, and paradise fish.
I find that in larger tanks and keeping him well feed with cucumber slices keep his bad attitude in check.