Do marbled or silver hatchet fish eat bladder snails?

Someone on hear suggested them for my tank and I love the idea but I want to add some more cover at the top of the tank for them as I've read thats what they like. If I get live floating plants I'm gauranteed to get another load of bladder snails come with them but it would look better and be more natural for the fish. If the hatchets eat the snails (or at least their eggs and babies) then I wouldn't see it as a problem but if they dont then I might go for a fake plant instead as I don't want to get overrun with them again.