Bukkit

hi im wondering i fyou can help i have this plugin on my server along with a few mods, one of the mods is AE2 and im trying to use certus quarts seeds (need to be dropped in water and left) but when ever i go to get them/check on their progress clearlagg has removed them from the world, ive tryed lookin in the config for a list i can add the id too to prvent it from removing the item but i cannot seem to find it is there a way i can add it to a list so it wont get removed thanks