Unintentionally, I found that Peacock Gudgeons seem to like snail eggs. I haven't really done much since the original post to control the population of snails, but they haven't seemed to get out of control... yet.
Assassin snails are amazing, they have cycles of hunting time and hiding, but when they hunt 5 assassins will clear out my 55g tank of pond and rams horns(50+) in one sitting , if they arent hungry they just kill them for 'fun'!
Assassin snails = $5, no pest snails = priceless!!