I use a commercially available Laterite mixed with fine unwashed aquarium gravel ( I mean fine, not pea and certainly not sand) Fill base area of aquarium to a depth of around 30mm, Top this off with 40mm of the same fine gravel only this time thoroughly wash it.
Works well for me.
See http/www.fishforums.net/content/Tropical...Algae-Control-/
For pics
Regards
BigC