Lower to moderate light IME. I keep my Indonesian Acan's on my sandbed, and they're doing groovy. If you want to keep the Acan's under higher intensity light, just be sure to take the time to acclimate them to it. Feeding is optional, (I never feed mine - they just catch any stray food drifting around after I feed my fish) though some say feeding has really helped the reproduction rates in their Acan's.