SUPERWORMS!! They have the protein of over 20 crickets and my silver goes nuts for them. Not recommended for small aros though since they have a harder shell. (big grasshoppers are great too once the aro is 8-10")
My bearded dragons and archer fish love those too. I was thinking about trying those and then I thought of how they can stay alive after being eaten and chew on the animals innards. friend of mine lost an exodon because of that. creepy way to go!