Thanks Dimos and Revolutionhope.
I am understand that many shrimp keeper want to have a beauty aquarium with ornamental fish and shrimp swim together with peace, I know, cause I did it past ago ?.
But, as i stated above, please be patient and never thing again about that if Your purpose not just to have shrimp in aquarium, but want to have peacefull colony of shrimps, in my experience, even otocinclus, must be really veggie fish, can disturb the shrimps, even can make shrimplets "shocked" become shy, hiding along the days (maybe cause fear). For now, I even thinking why I keep fish like otocinclus to my shrimp colony only to eat algae, cause the shrimp is algae eaters too :(
if You want keeping shrimp with snails, I don't see much problem with it, as long as not too much snails.
attention, sorry for My English :D