If you're doing it as a cool trick, don't, there's better options.
Once a week I give my O's live food to give them some actvity, and to have a balanced diet. My roommates know it's the coolest thing to watch because usually theres 4 people including myself in front of the tank while I dump in a bag of ghost shrimp, toss in a few crickets, and soon, I'll be trying out dwarf frogs (I should post pictures of that on an ADF site lol)
cheers
oh btw, hot dogs will leave a nasty protein film on the waters surface, so although it wont kill your fish, it's just a PITA and makes your tank look like crap.