Wazza, my silver dollars won't eat from the top of the tank and I can't understand why! I have tried floating lettuce, spirulina flakes etc and they just don't get it! We have named our two silver dollars Paris and Nicole because I swear they seem to have left their brains behind - love em dearly though.
Staplez, they have so far been great with our other small fish - we have clown loaches, tetras, a fighter and some guppies and they pretty much leave them alone which is good.